Question
A and B can complete a work in 20 and 30 days,
respectively. If they work together for 10 days and then A leaves, how many more days will B take to finish the work?Solution
A's work rate = 1/20 per day. B's work rate = 1/30 per day. Together, A and B’s combined work rate = 1/20 + 1/30 = 1/12 per day. In 10 days, they will complete: (1/12) × 10 = 5/6 of the work. Remaining work = 1 - 5/6 = 1/6. B alone can complete 1/30 of the work per day, so the time B will take to complete 1/6 of the work is: (1/6) ÷ (1/30) = 5 days. Correct option: a
12.052 + 36.15 × 25.45 – 124.15 × 15.05 = ? × 8.08 – 64.32 × 15.98
What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)...
(48.89 ÷ 7.08) × (35.96 ÷ 4.11) + (9.02 × 1.99) = ?
35.05% of 14.87 × (13.02 – ?) + 30.19 = 188.7
40.02% of 1220.05 = ?2 + 29.09 × 7.99
√2401 × (√2116 ÷ 23) × 21 ÷ 3 = ?
49.99% of 639.99 + 159.98% of 49.99 = ?2
480 ÷ 10 + 18 % of 160 + ? * 9 = 60 * √36
(24.98)2 = ?2Â + (14.99)2
1449.98 ÷ 50.48 × 10.12 = ? × 2.16