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If 12 boys earn Rs 840 in 7 days, what will 15 boys earn in 6 days?

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If 12 boys earn Rs 840 in 7 days, what will 15 boys earn in 6 days?

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The given details are,

Earning of 12 boys in 7 days = Rs 840

Earning of 12 boys in 1 day = Rs 840/7

= Rs 120

Earning of 1 boy in 1 day = 120/12 = Rs 10

Earning of 1 boy in 6 days = 10 × 6 = Rs 60

∴ Earning of 15 boys in 6 days = 60 × 15 = Rs 900

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