The average of four numbers is 25. Three numbers are 20, 25, 30. What is the fourth? MCQ with Answer and Explanation

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The average of four numbers is 25. Three numbers are 20, 25, 30. What is the fourth?

A. 30

B. 25

C. 20

D. 35

Answer: Option B

Solution (By JKSSB Mock Tests)

Sum=100. Fourth=100-75=25.

This question belongs to: Maths Average

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Question #1

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If the average of 7 numbers is 35 and the average of first 4 is 32, average of last 4 is 38. What is the 4th number?

A. 35

B. 32

C. 30

D. 28

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Correct Answer: Option A

Explanation:
Sum of 7 = 7×35=245. Sum first 4=4×32=128. Sum last 4=4×38=152. 4th number = 128 + 152 - 245 = 35.

This question belongs to: Maths Average

Question #2

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Average of 8 numbers 1550. If average of 5 is 1545, average of remaining 3?

A. 1558.33

B. 1560

C. 1557

D. 1555

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Correct Answer: Option A

Explanation:
Sum8=12400. Sum5=7725. Remaining=4675. Average≈1558.33.

This question belongs to: Maths Average

Question #3

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What is the average of the first 6 multiples of 2?

A. 7

B. 6

C. 8

D. 9

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Correct Answer: Option A

Explanation:
Multiples:2,4,6,8,10,12 sum=42, count=6, avg=7.

This question belongs to: Maths Average

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