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8 workers can built a wall 18m long, 2m broad and 12m high in 10 days, working 9 hours a day. Find how many workers 3m broad and 9m high in 8 days working 6 hours a day

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answer is C.

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Detailed Solution

$\frac{18 \times 2 \times 12 \times 10 \times 6}{10} = \frac{9 \times 32 \times 3 \times 9 \times 8}{x}$

$x = \frac{9 \times 32 \times 3 \times 9 \times 8 \times 10}{18 \times 2 \times 12 \times 8 \times 6} = 30 workers$

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