16 . The average of 6 number is 8.5, when one number is discarded the average of the remaining numbers becomes 7.2. What is the discarded number?

A. 7.8
B. 9.8
C. 10
D. 12.4
E. 15

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Answer: Option E

Explanation:

The average of 6 numbers is 8.5

So, the sum of 6 numbers is 8.5x6 or 51

The average of 5 numbers is 7.2

So, the sum of 5 numbers is 7.2x5 or 36

So, the discarded number is 51 - 36 or 15

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17 . The average of five numbers is 27. If one number is excluded, the average becomes 24. The excluded numbers is:

A. 25
B. 27
C. 30
D. 35

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Answer: Option D

Explanation:

18 . The average of Selim’s marks in 7 subjects is 75. His average in six subjects excluding Science is 72. How many marks did he get in Science?

A. 72
B. 90
C. 93
D. 98
E. 86

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Answer: Option C

Explanation:

Hints:average mark = মোট 7 টি subject এর mark /7

science এর মার্ক = ( 7 × 75 - 6 × 72) = 93

19 . The average temperature for the first 4- days of a week is 40.2-degree Celcius and that of the last 4 days is 41.3-degree Celcius If the average temperature for the whole week is 40.6-degree Celcius then the temperature on the fourth day is-

A. 38.5 Degree Celcius
B. 40.8 Degree Celcius
C. 41.3 Degree Celcius
D. 41.8 Degree Celcius

View Answer	Favorite Question

Answer: Option D

Explanation:

Temperature on the fourth day
= [(40.2 × 4 + 41.3 × 4) - (40.6 × 7)]° C
= 41.8° C

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A. 57
B. 59
C. 53
D. 55
E. None

View Answer	Favorite Question

Answer: Option A

Explanation:

The total weight of them = 53×3 = 159 kg

Minimum weight possible for any 2 of them = 51×2 = 102 kg

Maximum weight of any 1 of them = 159 - 102 = 57 kg

21 . The solution set of the inequality (2x + 1) < 9(4 - x) is--

A. -5 < x < 7/4
B. x ≤ -5 and x ≥ 7/4
C. -7/4 < x < 5
D. x > 5 and x < -7/4
E. None of these

View Answer	Favorite Question

Answer: Option E

Explanation:

22 . A club has 8 male & 8 female members. The club is choosing a committee of 6 members. The committee must have 3 male & 3 female members. How many different committees can be chosen?

A. 720
B. 112
C. 9
D. 3136
E. 112896

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Answer: Option D

Explanation:

23 . A number is selected at random from 40 to 50 inclusive. What is the probability that the number is prime number?

A. 3/11
B. 3/10
C. 2/11
D. 1/5
E. None of these

View Answer	Favorite Question

Answer: Option E

Explanation:

Total number of numbers = 59 - 40 + 1 = 20

Prime numbers : 41, 43, 47, 53, 59 = 5 in total

So, the probability = 5/20 = 1/4

24 . Average of 5 consecutive even numbers is 8, Which is the smallest of the 5 number

A. 4
B. 6
C. 8
D. 10

View Answer	Favorite Question

Answer: Option A

Explanation:

here,let, the consecutive even numbers are = n,n + 2,n + 4,n + 6,n + 8

here, (n + n + 2 + n + 4 + n + 6 + n + 8)/5 = 8

or,5n + 20 = 40

or,5n = 20

or,n = 4

so, the smallest of the numbers is 4

ans: 4

25 . In a class if 4 student sit in each bench there are 3 empty benched , but 6 students have to stand if 3 studnet sit each bench . How many students are there3 in that class?

A. 50
B. 60
C. 70
D. 80

View Answer	Favorite Question

Answer: Option B

Explanation:

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16 . The average of 6 number is 8.5, when one number is discarded the average of the remaining numbers becomes 7.2. What is the discarded number?

17 . The average of five numbers is 27. If one number is excluded, the average becomes 24. The excluded numbers is:

18 . The average of Selim’s marks in 7 subjects is 75. His average in six subjects excluding Science is 72. How many marks did he get in Science?

19 . The average temperature for the first 4- days of a week is 40.2-degree Celcius and that of the last 4 days is 41.3-degree Celcius If the average temperature for the whole week is 40.6-degree Celcius then the temperature on the fourth day is-

20 . The average weight of 3 men is 53 kg. None of them weights less than 51 kg. What is the maximum possible weight (in kg) of a person in that group?

21 . The solution set of the inequality (2x + 1) < 9(4 - x) is--

22 . A club has 8 male & 8 female members. The club is choosing a committee of 6 members. The committee must have 3 male & 3 female members. How many different committees can be chosen?

23 . A number is selected at random from 40 to 50 inclusive. What is the probability that the number is prime number?

24 . Average of 5 consecutive even numbers is 8, Which is the smallest of the 5 number

25 . In a class if 4 student sit in each bench there are 3 empty benched , but 6 students have to stand if 3 studnet sit each bench . How many students are there3 in that class?

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