781 . A discount series 10%, 15% and 20% is equal to a single discound of :

A. 38.8%
B. 61.2%
C. 76.5%
D. 23.5%

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Answer: Option A

Explanation:

the single equivalent discount can be calculated as: 1 - (1 - d1) × (1 - d2) × (1 - d3), where d1, d2, d3 are the discounts. Therefore, the single discount equivalent to the successive discounts of 10%, 15%, and 20% is 38.8% or 0.388

তিতাস গ্যাস ট্রান্সমিশন এন্ড ডিষ্ট্রিবিউশন কোম্পানী লি. | সহকারী ব্যবস্থাপক (অ্যাকাউন্টস) | ২৭.০৪.২০১৮

A. 25%
B. 16.67%
C. 8.33%
D. 6%

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Answer: Option C

Explanation:

প্রশ্নে বলা হচ্ছে যে, 45 টাকা কেজি দরের 2 কেজি Vegetable ঘি'র সাথে 70 টাকা কেজি দরের 3 কেজি Standard ঘি'র সাথে Mix করে তা 65 টাকা কেজি দরে বিক্রয় করা হলো । শতকরা লাভের পরিমাণ কত ?
2 কেজি Vegetable ঘি'র ক্রয়মূল্য = 2 × 45 = 90 টাকা
আবার, 3 কেজি Standard ঘি'র ক্রয়মূল্য = 3 × 70 = 210 টাকা
(2 + 3) = 5 কেজি ঘি'র মোট ক্রয়মূল্য = 90 + 210 = 300 টাকা
আবার, 5 কেজি ঘি'র বিক্রয়মূল্য = 5 × 65 = 325 টাকা
লাভ হয় = (325−300300 × 100) = (25300 × 100) = 8.33%

783 . A does a work in 10 days and B does the same work in 15 days. In how many days they together will do the same work?

A. 5 days
B. 6 days
C. 8 days
D. 9 days

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Answer: Option B

Explanation:

Hints: A and B in 1 day together work ( 1/10 + 1/15) portion = (3 + 2)/30 = 5/30 = 1/6

Together they finish in 6 days.

784 . A drink contains 20% cranberry juice, 20% raspberry juice and the rest is apple juice. You added 250 ml water in 750 ml of the drink. Now, what is the ratio of water of water to apple juice in the drink?

A. 6:5
B. 9:5
C. 5:12
D. 5:9
E. None of these

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Answer: Option D

Explanation:

60% of 750 = 0.6× 750 = 450

Now, 250 : 450 = 5 : 9

785 . A driver of an auto rickshaw sees a lorry m ahead of him .After 30 seconds the lorry 90 m behind. If the speed of the auto rickshaw is 38 km /hr, then what is the speed of the lorry?

A. 23 km/hr
B. 25 km /hr
C. 20 km /hr
D. 18 km /hr

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Answer: Option C

Explanation:

জনতা ও রূপালী ব্যাংক- অফিসার ১৩.১২.২০১৯

A. 2/3
B. 3/4
C. 5/6
D. 1/6

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Answer: Option C

Explanation:

Let's break it down:

Number of favorable outcomes (odd numbers): There are three odd numbers on a six-sided dice, which are 1, 3, and 5.

Number of favorable outcomes (numbers less than 4): There are three numbers less than 4 on a six-sided dice, which are 1, 2, and 3.

However, we need to be careful not to count the number 1 twice since it satisfies both conditions (odd and less than 4).

So, the total number of favorable outcomes is 3 + 2 - 1 = 4.

Total number of possible outcomes: Since we are rolling a fair six-sided dice, there are six possible outcomes (numbers 1 to 6).

Now, we can calculate the probability:

Probability = (Number of favorable outcomes) / (Total number of possible outcomes) Probability = 4 / 6 Probability = 2 / 3

Therefore, the probability of getting an odd number or a number less than 4 when rolling a fair six-sided dice is 2/3

787 . A farmer built a fence around around his square plot. He used 27 fence poles on each side of the square. How many poles did he need altogether?

A. 100
B. 104
C. 108
D. 120
E. None of these

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Answer: Option B

Explanation:

Lets see if he needed 5 poles at each side
Similarly, no. of poles  =  27  ×  2  +  25  ×  2  =  104

788 . A farmer had 20 hens. All but 2 died. How many hens are still alive?

A. 2
B. 10
C. 15
D. 18

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Answer: Option A

Explanation:

All but 2 died means only 2 survived.

789 . A farmer had 20 hens. All but 2 died . How many hens are still alive ?

A. 2
B. 10
C. 15
D. 18

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Answer: Option A

Explanation:

All but 2 died means only 2 survived.

Bangladesh Bank - Assistant Director - 2009

A. 2K
B. 6K
C. 7K
D. 8K

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Answer: Option D

Explanation:

Let the length and width of the smaller field be L and W respectively.

So, area of the smaller field, K = L×W

Now, area of the larger field = 2L×4W = 8 L×W = 8K

791 . A farmer is constructing a fence by stringing wire between two posts 20 feet apart. In the fence is 600 feet long. how many posts must the farmer.

A. 29
B. 30
C. 31
D. 32

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Answer: Option C

Explanation:

792 . A father's age is 4 times his son's now. 20 years from now, the father's age will be double his son's age. What will be the son's age 10 years from now?

A. 20
B. 30
C. 25
D. 10

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Answer: Option A

Explanation:

Let's son's Age = x

Fathers Age = 4x

4x + 20

2 ( x + 20)

2x = 20

x = 10

10 + 10 = 20

793 . A father is three times as old as his son. After fifteen years the father will be twice as old as his son's age at that time. Hence the father's present age is--

A. 36
B. 42
C. 45
D. 48

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Answer: Option C

Explanation:

Present age of father = 3x

Present age of son = x

After fifteen years there ages will be 3x + 15 and x + 15

By the given condition

3x + 15 = 2(x + 15)

3x + 15 = 2x + 30

X = 15

Therefore present age of father = 3x = 3×15 = 45 years (ans)

794 . A father is three times as old as his son. After fifteen years the father will be twice as old as his son's age at that time . Hence the father's present age is ---

A. 36
B. 42
C. 45
D. 48
E. None of these

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Answer: Option C

Explanation:

Let, Son = x

Father = 3x

3x + 15 = 2 ( x + 15)

x = 30 - 15 = 15

3x = 45

Bangladesh Bank - Assistant Director - 2009

A. 10 years
B. 12 years
C. 18 years
D. 23 years
E. 23 years

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Answer: Option E

Explanation:

781 . A discount series 10%, 15% and 20% is equal to a single discound of :

782 . A dishonest trader mixes 2 kg of vegetable ghee costing Tk. 45 a kg with 3 kg of standard ghee costing Tk. 70 per kg. He sells the mixed ghee at Tk. 65 per kg. what is his percentage of profit?

783 . A does a work in 10 days and B does the same work in 15 days. In how many days they together will do the same work?

784 . A drink contains 20% cranberry juice, 20% raspberry juice and the rest is apple juice. You added 250 ml water in 750 ml of the drink. Now, what is the ratio of water of water to apple juice in the drink?

785 . A driver of an auto rickshaw sees a lorry m ahead of him .After 30 seconds the lorry 90 m behind. If the speed of the auto rickshaw is 38 km /hr, then what is the speed of the lorry?

786 . A fair six-sided dice is rolled. Find the probability of getting an odd number or a number less then 4 -

787 . A farmer built a fence around around his square plot. He used 27 fence poles on each side of the square. How many poles did he need altogether?

788 . A farmer had 20 hens. All but 2 died. How many hens are still alive?

789 . A farmer had 20 hens. All but 2 died . How many hens are still alive ?

790 . A farmer has two rectangular fields. The larger field has twice the length and four times the width of the smaller field. If the area of the smaller field is K units, what is the area of the larger field?

791 . A farmer is constructing a fence by stringing wire between two posts 20 feet apart. In the fence is 600 feet long. how many posts must the farmer.

792 . A father's age is 4 times his son's now. 20 years from now, the father's age will be double his son's age. What will be the son's age 10 years from now?

793 . A father is three times as old as his son. After fifteen years the father will be twice as old as his son's age at that time. Hence the father's present age is--

794 . A father is three times as old as his son. After fifteen years the father will be twice as old as his son's age at that time . Hence the father's present age is ---

795 . A father said to his son , " I was as old as you are at present at the time of your birth". If the father,s age is 36 years now, the son's five years back was____

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