Average Practice Test 3

Question : 25 of 40

Marks: +1, -0

The average height of 37 boys is 2.8 m. When 8 boys leave the group, then the average height increases by 1.8 m. What is the average height of the boys who left?

3 m
3.72 m
0.1 m
2 m
4 m

Validate

Solution:

Total height of 37 boys = (37 × 2.8) m = 103.6 m
New total height = (29 × 6) m = 133.4 m
∴ Average height of 8 boys

=({133.4-103.6}/8)m

= 3.72 m

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