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Question
If 12 boys earn Rs 840 in 7 days, what will 15 boys earn in 6 days?
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Solution
\[\text{ Earnings of 12 boys in 7 days = Rs . 840 } \]
\[ \therefore \text{ Earnings of 12 boys in 1 day } = Rs . \frac{840}{7} = Rs . 120\]
\[ \therefore \text{ Earnings of 1 boy in 1 day } = Rs . \frac{120}{12} = Rs . 10\]
\[ \therefore \text{ Earnings of 1 boy in 6 days = Rs } . \left( 10 \times 6 \right) = Rs . 60\]
\[ \therefore \text{ Earnings of 15 boys in 6 days } = Rs . \left( 60 \times 15 \right)\]
\[ = Rs . 900\]
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