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8 boys working 4 hours a day earn Rs. 320, how much will 7 boys working 2 hours a day will earn?

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8 boys working 4 hours a day earn Rs. 320, how much will 7 boys working 2 hours a day will earn?
1. Rs. 120
2. Rs. 130
3. Rs. 150
4. Rs. 140
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Correct Answer - Option 4 : Rs. 140

GIVEN:

8 boys working 4 hours a day earn Rs. 320.

FORMULA USED:

(B1 × D1)/W1 = (B2 × D2)/W2

CALCULATION:

By using the formula:

8 × 4 × W2 = 7 × 2 × 320

⇒ W2 = Rs. 140
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