Question
35 people working 7 hours a day take 22 days to complete
a task. How many people working for 6 hours a day are needed to complete five times the given task in 40 days if they work at 30% higher efficiency? (can calculate approximate value)Solution
Original work = 35 people × 7 hrs/day × 22 days = 5390 man-hours New task = 5 times the original = 26950 man-hours New workers: work 6 hrs/day for 40 days, but 30% more efficient, so effective = 7.8 hrs/day Total work each person can do = 7.8 × 40 = 312 hrs Let number of people = x, so total work = 312x=26950 Solving: x = 26950 ÷ 312 ≈ 86.37 or 87
?% of (168 ÷ 8 × 20) = 126
20% of 1500 – 75% of 200 = 125% of ?
Find the value of 16 X [(8 - 5) of 12 ÷ 4].
√196 + (0.25 × 144) + 19 = ? + 72
22 * 6 + 45% of 90 + 65% of 180 = ?
52% of 400 + √(?) = 60% of 600 - 25% of 400
(25 × 12 + 30 × 8 – 22 × 10) = ?
What will come in the place of question mark (?) in the given expression?
(240% of 175 ÷ √16) X 6 + 80% of 400 = ?3 + 179 + 42
What will come in the place of question mark (?) in the given expression?
(144 × 16 ÷ 12) × 6 = ?
808 ÷ (128)1/7 + 482 = 4 × ? + 846
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