Question

15 boys earn 3900 in 5 days. How much
will 20 boys earn in 7 days?​

Answer 1

Question :-

15 boys earn 3900 in 5 days. How much will 20 boys earn in 7 days?

Answer :-

15 boys earn 3900 in 5 days

In 1 day they can earn 3900/5 = 780

so 15 boys can earn 780 in 1 day

1 boy can earn 780/15 = 52 in 1 day

so earning of 20 boys in 7 days =

20 × 7 × 52 = 7280

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Answer 2

15 boys earn in 5 days = 3900

1 boys earn in 1 days = 3900 ÷ (15×5)

1 boys earn in 1 days = 3900 ÷ 75

1 boys earn in 1 days = 52

20 boys earn in 7 days = 52 × 20 × 7

20 boys earn in 7 days = 7280