Question
A and B together can complete a task in 12 days, while B
and C together can complete the same task in 15 days. A and C together take 20 days to finish it. If A, B, and C work together, how many days will they take to complete the task?Solution
1/A + 1/B = 1/12 1/B + 1/C = 1/15 1/A + 1/C = 1/20 Adding the three equations: 2(1/A + 1/B + 1/C) = 1/12 + 1/15 + 1/20 = 1/5 (1/A + 1/B + 1/C) = 1/10 So, the total time = 10 days. Correct Option: c) 10 days
More Time and work Questions
(30 × 0.80)⁴ ÷ (2160 ÷ 60)⁴ × (54 × 16)⁴ = (6 × 4)?+5
3/7 of 504 ÷ 12 + 17 = √?
20% of 150 + 30 X 4 = ? X 5
52% of 400 + √(?) = 60% of 600 - 25% of 400
135÷ 15 x 19 + 14807 = ? + √3249 - √9604
(22² × 8²) ÷ (92.4 ÷ 4.2) =? × 32
15 * 12 + 35% of 80 + 70% of 130 = ?
60 % of 640 - 57 × 2 - 1520 / 38 = ?
- Find the simplified value of the given expression:
10 of 5 ÷ 4 × 2² + √25 – 8 (168 ÷ 12 + 19 × 64)/(22+1) = ?
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