The average height of 25 boys is 1.4 m. When 5 boys left the group, the average height increased by 0.15m. What is the average height of the boys who left?

0.8 m

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1.1 m

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1.2 m

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1.25 m

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None of these

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Solution

The correct option is A 0.8 m
Sum total of heights of the 25 students $= 25 \times 1.4 = 35$ m
Sum of total of heights of remaining 20 students $= 20 \times 1.55 = 31$ m
Average height of the 5 boys who left $= \frac{4}{5} = 0.8$ m

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The average height of 25 boys is 1.4 m. When 5 boys left the group, the average height increased by 0.15m. What is the average height of the boys who left?

The correct option is A 0.8 mSum total of heights of the 25 students =25×1.4=35 m Sum of total of heights of remaining 20 students =20×1.55=31 m Average height of the 5 boys who left =45=0.8 m

The correct option is A 0.8 m
Sum total of heights of the 25 students $= 25 \times 1.4 = 35$ m
Sum of total of heights of remaining 20 students $= 20 \times 1.55 = 31$ m
Average height of the 5 boys who left $= \frac{4}{5} = 0.8$ m