Question

A contractor has to built a bridge in 50 days .Initially he employed 20 men but found that only half of the work has been completed in 30 days.How many more men does he have to employ to finish his job in time.​

Answer 1

Answer:

Each man builds (1/2)(1/30)(1/20) = 1/1200 of the bridge per day.

He has 20 days left and he needs to build 1/2 the bridge.

Let x = the number of men he needs to build the other 1/2. (this will not be your answer).

(1/1200) * 20 * x = 1/2

x = 30 men

Now the answer to the question is either 30 men total or he has to hire 10 more. It depends on how the choices go. thirty looks better to me.

Step-by-step explanation:

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