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If 5 carpenters working 6 hours a day make 220 chairs in 100 days, then the number of chairs made by 10 carpenters in 20 days each working 8 hours a day is

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117

138

126

answer is B.

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Detailed Solution

$\frac{5 \times 6 \times 100}{220} = \frac{10 \times 8 \times 20}{x}$

$x = \frac{10 \times 8 \times 20 \times 220}{5 \times 6 \times 100} = \frac{352000}{3000} = 117.33 ≃ 117$

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