Question
Working alone, 'C' can complete a job in 30 days. 'D'
takes 20% less time than 'C' to finish the same job. Calculate the percentage of work done by 'C' and 'D' together in 4 days.Solution
ATQ, Time taken by 'D' alone: 0.8×30=24 days Total work: LCM of 24 and 30 = 120 units Efficiency of 'C': 120/30=4 units/day Efficiency of 'D': 120/24=5 units/day Combined efficiency of 'C' and 'D': 4+5=9 units/day Work done in 4 days: 9×4=36 units Percentage of total work done: (36/120)×100=30 Therefore, 'C' and 'D' together complete 30% of the work in 4 days.
- What will come in place of (?) in the given expression.
(25% of 320) + (15% of 240) = ? The speed of the stream is 10 km/h. Boat ‘A’ covers 110 km distance against the stream in 11 hours and boat ‘B’ covers 65 km distance against th...
[(1245 ÷ 9) ÷ 12] × 540 = ?2 – 175
25639 – 5252 – 3232 = ?
Find the value of ‘a’ in the following expression:
12 × a × 24 ÷ 8 + 72 – 46 = 170
- What will come in the place of question mark (?) in the given expression?
(198/13) X (52/11) - ? ÷ 5 = 13 + 68 ÷ 4 What will come in the place of question mark (?) in the given expression?
? = (40% of 80% of 6400) ÷ 64
√361 ÷ (21/23) × 84 = ?
96% of 4500 – 34% of 650 = ?
25% of 60 × 15% of 120 = 30% of (?)
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