Question
‘A’ and ‘B’ can build a wall in 8 days and 12
days, respectively. If ‘A’ started building the wall alone but after 4 days he was replaced by ‘B’, then find the total time taken to build the wall.Solution
Let total work be 24 units = LCM of (8 and 12)Efficiency of ‘A’ = 24/8 = 3 units/dayEfficiency of ‘B’ = 24/12 = 2 units/dayTotal work done by ‘A’ in 4 days = 4 × 3 = 12 unitsTime taken by ‘B’ to build rest of the wall = {(24 – 12)/2} = 6 daysTotal time taken = 6 + 4 = 10 days
More Approximation Questions
- Determine the final value of this expression:
(1/5) of {5⁴ - 24 × 14 + 12 × 18 - 10.5 of 10²} 3% of 842 ÷ 2% of 421 = ?
√225 + 27 × 10 + ? = 320
- Determine the value of ‘p’ if p = √529 + √1444
45 % of 180 + √144 * 8 = ?2 + 70 % of 80
Determine the value of 'p' in following expression:
720 ÷ 9 + 640 ÷ 16 - p = √121 X 5 + 6²- 7?2 = √20.25 × 10 + √16 + 32
- What will come in place of the question mark (?) in the following questions?
(2⁴ + 6²) ÷ 2 = ? 18(1/3) + 9(2/3) – 10(1/3) = 1(2/3) + ?
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