Question

A contractor got a contract to build a building in 30 days and employed 20 men to do the work.

Only 1/4 work was completed in 10 days. How many more men be employed so that the work be

completed in the specified time?​

Answer 1

Answer:

5 men may be

Step-by-step explanation:

if 20 men 1/4work completed in 10 days so they completed they work in 40 days

Answer 2

Step-by-step explanation:

A contractor got a contract to build a bridge in 30 days and employed 20 men to do the work only 1/4 work was completed in 10 days. How many more men should be employed so that the work is completed in the specified time?

First of all, we need to assume that the rate of completion per man employed will remain constant (In reality this is unlikely - the preparatory work is likely to be more time-consuming, so more will get done in subsequent days - but given that this is clearly a maths test question, we can safely make the assumption).

So, in 10 days, 20 men did 25% of the task. If no additional men were hired, we would expect those 20 men to carry out a further 50% of the task in the remaining 20 days.

But we need to carry out 75% in those 20 days. Which means we need 75/50 x 20 men, which equals 30 men in total.

Therefore, He needs to hire an extra 10 men.