If 5 writers can write 50 books working 10 hours a day, then how many books can be made when 15 writers work for 20 hours a day?

250

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300

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185

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198

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Solution

The correct option is B 300
More writers means more books can be made, so it is in direct proportion. The proportion is 5:15∷50:x

If more hours spend, then more books can be made, so it is in direct proportion. The proportion is 10:20∷50:x

We know that the product of extremes = the product of means.

5×10×x=15×50×20

x=(15×50×20)/(5×10)=15×20

=300

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