Question
‘X’ and ‘Y’ together can complete a work in 10
days, while ‘Y’ and ‘Z’ together can complete the work in 8 days. If ‘Y’ takes 12 days to complete the work alone then find the approximate time taken by all three together to complete 65% of work.Solution
Let the total work = 120 units Efficiency of (X + Y) = 120/10 = 12 units/day Efficiency of (Y + Z) = 120/8 = 15 units/day Efficiency of ‘Y’ = 120/12 = 10 units/day Efficiency of (X + Y + Z) = (12 + 15 – 10) = 17 units/day Required time taken = (0.65 × 120)/17 = 5 days (approx)
7, 26, 238, 962, 8522, 34078
41 48 89 137 226 ?
...5Â Â Â Â Â Â Â Â Â Â Â Â Â Â 9Â Â Â Â Â Â Â Â Â Â Â Â Â Â 30Â Â Â Â Â Â Â Â Â Â Â 115Â Â Â Â Â Â Â Â Â 582Â Â Â Â Â Â Â Â Â 3483
15Â Â Â Â ...
69    119    156    ?     199    209
25 13.5 12.5 20.75 39.5 ? 302.25
...440                 482              526                  572                ?  �...
If  2  4  6  x  14  28  30
Then, x³+ 2 x+1 = ?
12 7 10 25 107 ?
...19, 37, 65, 91, 127, 169
22Â Â Â 23Â Â Â Â 32Â Â Â Â 57Â Â Â 106Â Â Â ?
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