Question
Thirty men working 8 hours daily
complete a task in 16 days. If the work increases to three times the original and needs to be finished in 20 days by workers putting in 6 hours per day with a 20% increase in their efficiency, how many men are required?Solution
ATQ, Let the total work be 'W' units and eiciency of each man be 'E' units/hour Let the number of men required be 'M'. ATQ: {(30 X 16 X 8 X E)/W} = {(M X 20 X 1.2E X 6)/(3 X W)} Or, M = 80
What will come in place of the question mark (?) in the following series?
21, 36, 66, 126, ?, 486
10,14,26,42,70,?
81, 41, 42, 64.5, ?, 330
What will come in place of the question mark (?) in the following series?
5, 14, 41, 122, 365, 1094, ?
1500 Â Â Â 150Â Â Â 30Â Â Â ? Â Â Â Â 3.6Â Â Â Â 1.8
Find the missing number in the series:
7, 21, 19, 57, 55, ?
71, 79, 88, 152, ?, 393
1     1      4       ?      280       3640
...3, 10, 29, 66, ?
Find the missing number in the given number series.
 1165, ?, 1040, 985, 935, 890Â
