2206 . If the ratio of speed of doing work of the persons is 1 : 3 : 5 , what is the ratio of this taken by these people to do the same amount of work ?

A. 15 : 5 : 3
B. 15 : 5 : 7
C. 3 : 15 : 5
D. 15 : 3 : 5

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Answer: Option A

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জনতা ও রূপালী ব্যাংক- অফিসার ১৩.১২.২০১৯

A. 3/5
B. 2/7
C. 1/3
D. 1/2

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Answer: Option A

Explanation:

আমরা জানি,
বৃত্তকলার ক্ষেত্রফল = θ/360πr2

বৃত্তের ক্ষেত্রফল = πr2

শর্তমতে, θ/360πr2:πr2=3:5

⇒θ360πr2/πr2 =3/5

⇒θ/360=3/5

.:. বৃত্তকলার দৈর্ঘ্য ও বৃত্তের পরিধির অনুপাত = θ/360×2πr
____________
2πr

=θ/360=3/5

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জীবণ বীমা কর্পোরেশন (সহকারী ম্যানেজার) 16-10-2020

2208 . If the ratio of the areas of 2 squares is 2:1, then the ratio of the perimeters of the squares is

A. $1 : 2$
B. $1 : \sqrt{2}$
C. $2 : 1$
D. $\sqrt{2} : 1$

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Answer: Option D

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Bangladesh Bank - Assistant Director - 2010

A. 4 : 9
B. 9 : 4
C. 2 : 3
D. 3 : 4

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Answer: Option B

Explanation:

area of circle = pi * r2
a1 / a2 = r1 2 / r2 2 = (3) 2 / (2) 2 = 9 / 4

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2210 . If the ratio of two numbers is 3: 4 and their least common multiple is 60, then the numbers are-

A. 15, 20
B. 12, 16
C. 9,12
D. 18, 24

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Answer: Option A

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অফিসার (জেনারেল) - 12.11.2021

A. 28
B. 34
C. 82
D. 54

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Answer: Option A

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Probashi Kallyan Bank-Officer (Cash)-25-09-2021

A. 4
B. 5
C. 6
D. 2

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Answer: Option A

Explanation:

The given information can be represented as:

X * (X - 1) = X^2 - 4

Now, since it is mentioned that the result obtained by multiplying X by a number 1 less than itself is 4 less than multiplying X by itself,

we can set up the equation:

X * (X - 1) = X * X - 4

or, X^2 - X = X^2 - 4

or, -X = -4

So, X = 4

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2213 . If the salary of an employee is reduced by 10 percent for his late attendance and then increased by 10 percent on a pardon, how much does he loss?

A. 2%
B. 1%
C. 1/2%
D. 9%

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Answer: Option B

Explanation:

এখানে, শতকরা হ্রাস পেলো = 10 - 10 - 10 × 10/100 = - 1%

সু্তরাং, শতকরা 1% হ্রাস পেল।

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2214 . If the sales tax on an appliance priced at Tk.300 is between 5% and 8%, then the cost (price plus sales tax) of the appliance can be:

A. 310
B. 325
C. 318
D. 314

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Answer: Option C

Explanation:

minimum value = 300 + .05 * 300 = 315
maximum value = 300 + 0.08 * 300 = 324
318 it is !!

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2215 . If the side of a square increases by 40%, then the area of the square increases by-

A. 16%
B. 96%
C. 116%
D. 140%
E. None of these

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Answer: Option B

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বাংলাদেশ বনশিল্প উন্নয়ন কর্পোরেশন সহকারী ব্যবস্থাপক-০২.০৮.২০১৩

A. 16%
B. 21%
C. 32%
D. 100%

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Answer: Option B

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2217 . If the simple interest on a sum of money for 2 years at 5% per annum is Tk. 50. What is the compound interest on the same sum at the same rate and for the same time?

A. Tk. 52
B. Tk. 51.25
C. Tk. 54.25
D. Tk. 60

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Answer: Option B

Explanation:

Hints: Sum = Tk. ( 50× 100) / (2× 5) = Tk. 500

Amount = Tk. [ 500×(1 + 5/100)2]

= Tk. ( 500 × 21/20 × 21/20)

= Tk.551.25

Compound Interest i tk. ( 551.25 - 500) = Tk. 51.25

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2218 . If the standard length of an arc is 30m, what will be the radius of an 1 carne -

A. 1719 m
B. 1146 m
C. 1046m
D. 1619m

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Answer: Option A

Explanation:

3+7+x=18

x=8

average=3+7+8/3=6

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2219 . If the stock value of XYZ Company drops from TK. 25 per share to TK. 21 per share, what is the percentage decrease ?

A. 4%
B. 8%
C. 12%
D. 16%
E. None of these

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Answer: Option D

Explanation:

Percentage of decrease in share value = (25 - 21)/25×100% = 16%

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2220 . If the sum of (3, 7 and x) is 18, then the average of (3, 7 and x) is--

A. 6
B. 7
C. 8
D. 9

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Answer: Option A

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2206 . If the ratio of speed of doing work of the persons is 1 : 3 : 5 , what is the ratio of this taken by these people to do the same amount of work ?

2207 . If the ratio of the area of a sector to the area of the circle is 3:5. What is the ratio of the legth of theare in the sector to the circumference of the circle?

2209 . If the ratio of the radii of the two circles is 3 : 2, than the ratio of the areas of the two circles is:

2210 . If the ratio of two numbers is 3: 4 and their least common multiple is 60, then the numbers are-

2211 . If the ratio of two numbers is 3:3 and their L.C.M is 84, then find the greater number.

2212 . If the result obtained by multiplying a number x by a number 1 less itself is 4 less than multiplying x by itself, then x =?

2213 . If the salary of an employee is reduced by 10 percent for his late attendance and then increased by 10 percent on a pardon, how much does he loss?

2214 . If the sales tax on an appliance priced at Tk.300 is between 5% and 8%, then the cost (price plus sales tax) of the appliance can be:

2215 . If the side of a square increases by 40%, then the area of the square increases by-

2216 . If the sides of a square is increased by 10%, by what percent will the area of the square be increased ?

2217 . If the simple interest on a sum of money for 2 years at 5% per annum is Tk. 50. What is the compound interest on the same sum at the same rate and for the same time?

2218 . If the standard length of an arc is 30m, what will be the radius of an 1 carne -

2219 . If the stock value of XYZ Company drops from TK. 25 per share to TK. 21 per share, what is the percentage decrease ?

2220 . If the sum of (3, 7 and x) is 18, then the average of (3, 7 and x) is--

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