Days From Work

The questions in this section are very intriguing. Suppose there is some task, some physical work that a certain number of people are set to do. Suppose three people are digging a well. They finish this task in four days. If we increase the number of workers, the time taken to complete the task will decrease. The whole task here is to find the rate at which work is done per day. For example, let us see the following solved example.
We will have to develop a formula first. First, we have that Work =  Number of days (Time taken) (T or D) × Number of men (M). In other words, W = D × M.
Suppose w1 is the work done in the first case and w2 in the second case. Then the ratio is equal to w1/w2 = (T1 × N1)/(T2 × N2)