Read- Average: Basic Concepts, Formulas

1. The average weight of a group of boys and girls is 38 kg. The average weight of boys is 42 kg, and that of girls is 33 kg. If the number of boys is 25, then the number of girls is?

(a) 20

(b) 33

(c) 38

(d) 22

Click for Answer/Explanation

Correct Answer is (a)

2. A man had seven children. When their average age was 12 years a child aged 6 years was lost. Find the average age of the remaining 6 children.

(a) 12 years

(b)13 years

(c) 14 years

(d) 15 years

Click for Answer/Explanation

Correct Answer is (b)

3. There are four numbers. Average of the first three \/ is 15 and of last three is 16. If the last number is 19 find the first number.

a) 16

(b) 20

(c) 19

(d) None of these

Click for Answer/Explanation

Correct Answer is (a)

4. The average age of 40 boys is 16.95 years. By the addition of a new boy, the average of the class is raised to 17 years. What is the age of the new boy?

(a) 18 years

(b) 19 years

(c) 20 years

(d) None of these

Click for Answer/Explanation

Correct Answer is (b)

5. Find the average of 1950, 1952, 1953, 1954, 1961.

(a) 1953

(b)1954

(c) 1950

(d) None of these

Click for Answer/Explanation

Correct Answer is (b)

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