Time and Work Shortcut Methods
Time and Work problems are most frequently asked problems in quantitative aptitude. To solve these problems very quickly, you should understand the concept of Time and Work and some shortcut methods.
If a man can do a piece of work in 5 days, then he will finish 1/5th of the work in one day.
If a man can finish 1/5th of the work in one day then he will take 5 days to complete the work.
If a man 5/6th of work in one hour then he will take 6/5 hours to complete the full work.
If A works three times faster than B then A takes 1/3rd the time taken by B.
Here are some shortcut rules which can be very useful while solving Time and Work problems.
In total 9 rules are given here.
Rule 1: Universal Rule
This rule can be used in almost every problems.
If M1 persons can do W1 work in D1 days and M2 persons can do W2 works in D2days then we can say
M1D1W2 = M2D2W1
If the persons work T1 and T2 hours per day respectively then the equation gets modified to
M1D1T1W2 = M2D2T2W1
If the persons has efficiency of E1 and E2 respectively then,
M1D1T1E1W2 = M2D2T2E2W1
If A can do a piece of work in n days, then
The work done by A in one day = 1/n
If A can do a work in D1 days and B can do the same work in D2 days then A and B together can do the same work
Profit And Loss
Cost Price: It is the price at which any article or unit or item is bought. It is abbreviated as CP.
Profit = SP – CP
Loss: If Cost Price is greater than Selling Price then seller incurs loss.
Loss = CP – SP
One point is to be noted that loss or profit is always calculated with reference to CP.