Question
Rajesh and Bhupesh can complete a piece of work in 20
days and Bhupesh alone in 25 days. In how many days can Rajesh alone complete the work?Solution
ATQ, Rajesh and Bhupesh together finish the work in 20 days, which means their combined work rate is 1/20 of the work per day. Bhupesh alone finishes the work in 25 days, so his work rate is 1/25 of the work per day. To find Rajesh’s work rate, we subtract Bhupesh’s work rate from their combined rate: Combined rate - Bhupesh’s rate = Rajesh’s rate 1/20 - 1/25 = 5/100 - 4/100 = 1/100 Rajesh’s work rate is thus 1/100 of the work per day. To find out how long he takes to do the entire work, we take the reciprocal of his work rate: Rajesh can complete the work in 100 days.
24, 12, 18, ?, 157.5, 708.75
5 11 32 65 ? 389
...14Â Â 16Â Â Â 20Â Â Â 15Â Â 25Â Â Â Â 13Â Â Â 29Â Â Â 9Â Â Â 32Â Â Â 6
...640Â Â Â Â 322Â Â Â Â Â 164Â Â Â Â Â Â 86Â Â Â Â Â 48Â Â Â Â Â ?
...Select the number from among the given options that can replace the question mark (?) in the following series.
2, 6, 12, 20, ?, ?
123   125   129   132   ?   145
218, 108, 160, ? , 1385.50
412, 537, 573, 916, 980, ?
If  204    196       223   x  284
Then, what is the average of the numbers of the above series?
...462 478 510 558 ?
...
