Question
A alone can complete a work in 20 days and B alone in 30
days. A works alone for 10 days and then B joins him. In how many total days will the work be completed?Solution
A’s 1 day work = 1/20 B’s 1 day work = 1/30 Work done by A in 10 days = 10/20 = 1/2 Remaining work = 1/2 Together, A + B = 1/20 + 1/30 = 1/12 Time to finish remaining work = (1/2) / (1/12) = 6 days Total time = 10 + 6 = 16 days
In each of the following number series, one term is missing. Find the missing term.
2, 6, 15, 31, 56, ?, 141
4, 6, 12, 30, ?, 315, 1260
- What will come in place of the question mark (?) in the following series?
712, ?, 576, 508, 440, 372 246, 102, 202, ?, 174, 158
What will come in place of the question mark (?) in the following series?
4, 11, 32, 95, 284, 851, ?
10, ?, 50, 100, 250, 500
37, 49, 63, ?, 97, 117
124, 107, 91, ? , 62, 49
What should come in place of (?) question mark in the given number series.
5, 9, 17, 33, ?, 129
In each of the following number series, one term is missing. Find the missing term.
7, 14, 28, 56, 112, ?
