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Question

$$15$$ men can build a wall in $$60$$ days. How many more men are required to build another wall of same size in $$45$$ days?


A
2 men
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B
7 men
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C
5 men
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D
3 men
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Solution

The correct option is C $$5$$ men
Let $$x$$ men are required to build the wall in $$45$$ days.
Then $$x:15::60:45$$
$$\Rightarrow 45x=15\times 60$$
$$\Rightarrow x=\dfrac{15\times 60}{45}$$
$$x=20$$ men.
Hence, $$20-15=5 $$ more men are required.

Mathematics

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