Question
A and B together can complete a work in 12 days. B and C
together can complete the same work in 15 days, and A and C together can complete it in 20 days. How long will it take for A, B, and C to complete the work if all three work together?Solution
A+B = 12 days B+C = 15 days C+A = 20 days Let the total work has to be done by them = LCM of 12, 15, 20 = 300 A+B works in one day = 300/12 = 25 unit B+C works in one day = 300/15 = 20 unit C+A works in one day = 300/20 = 15 unit A+B+B+C+C+A = 25+20+15 = 60 unit A+B+C = 60/2 = 30 units Time taken to finish the work by A+B+C = 300/30 = 10 days
What approximate value will replace the question mark (?) in the following?
√48...
(16.16 ×  31.98) + 14.15% of 249.99 = ? + 99.34
(239.89 ÷ 3.89) – (144.01 ÷ 5.73) = ?2Â
- 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.)
2.51% of 800 - 3.97% of 250 = ?
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.)...
6940 ÷ 28 ÷ 7 =?
√3601 × √(224) ÷ √102 = ?
1726 1/3 + 40% of 1849.889 + 15.12 × 18.25 = ?
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