Work and Time Apptitude Questions
Trick 1: If M1 men can finish W1 work in D1 days and M2 men can finish W2 work in D2 days then, the relation is: M1*D1/W1 = M2*D2/W2
Trick 2: If M1 men finish W1 work in D1 days, working T1 time each day and M2 men finish W2 work in D2 days, working T2 time each day, then the relation is: M1*D1*T1/W1 = M2*D2*T2/W2
Trick 3: If A completes a piece of work in ‘x’ days, and B completes the same work in ‘y’ days, then,
Work done by A in 1 day = 1/X
Work done by B in 1 day = 1/Y
Work done by A and B in 1 day = 1/X + 1/Y
Total time taken to complete the work by A and B both = XY/(X + Y)
Trick 4: If A can do a work in ‘x’ days, B can do the same work in ‘y’ days, C can do the same work in ‘z’ days, then the total time taken by A, B and C to complete the work together = XYZ/(XY + YZ + ZX)
Trick 5: If A alone can do a certain work in ‘x’ days and A and B together can do the same work in ‘y’ days, then B alone can do the same work in = XY/(X – Y)
Trick 7: If A can do a work in ‘x’ days and B can do the same work in ‘y’ days and when they started working together, B left the work ‘m’ days before completion then the total time taken to complete work is = (Y + M)X / (X+Y)
Trick 8: If A leaves the work ‘m’ days before its completion then the total time taken to complete work is = (X + M)Y / (X+Y)
