Question

Three men can complete a certain work in 7 days.after one day work some more men joined and completed the remaining work in 3 days.how many men joined the three men after one days work.

Answer 1

After 1 day of work the 3 men alone would have done the work in 6 days. But it got doubled due to introduction of more men. Since time taken to finish the work and the number of people doing the work are inversely proportional, there are a total of 3*6/3 = 6 men. So 3 more have joined.