Question
P alone can finish a piece of work ‘M’ in 6 days
while Q takes 4 days to finish it alone. P, Q and R working together can finish the work ‘N’ which is 10 times of work ‘M’ in 8 days. How long will R take to finish work ‘N’, when working alone?Solution
Let the work ‘M’ = 12 units (LCM of 6 and 4) Efficiency of P = 12/6 = 2 units Efficiency of Q = 12/4 = 3 units Efficiency of P, Q and R = (12 × 10)/8 = 15 units per day Efficiency of R = 15 – (2 + 3) = 10 units per day Time taken by R to finish work ‘N’ = 120/10 = 12 days
- What will come in place of the question mark (?) in the following series?
3, 10, 29, 66, 127, ? - What will come in place of (?) in the given number series.
7, 14, 28, 56, ?, 224 What will come in place of (?) Question mark in the given number series.
28, 29, 38, 63, 112, 193, ?
What will come in place of (?) question mark in the given number series.
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In each of the following number series, one term is missing. Find the missing term.
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1, 6, 27, 124, ?, 3906, 27391
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15, 16, 25, 50, 99, 180, ?
415 246 367 ? 335 310
...36, 48, 24, 60, ?, 72
43, 56, 82, ?, 173, 238
