Question
A tank contains 80 litres of a mixture of milk and
water in the ratio 3 : 1 . If 20 litres of this mixture is removed and replaced with water, what is the ratio of milk to water in the final mixture?Solution
Initial mixture = 80 L; Milk : Water = 3 : 1 Milk = (3/4) × 80 = 60 L Water = 20 L 20 L mixture removed: Milk removed = (3/4) × 20 = 15 L Water removed = (1/4) × 20 = 5 L Milk left = 60 − 15 = 45 L Water left = 20 − 5 = 15 L Now 20 L water added: New water = 15 + 20 = 35 L Total = 45 (milk) + 35 (water) = 80 L Required ratio = 45 : 35 = 9 : 7
What will come in place of the question mark (?) in the following series?
15, 90, 450, ?, 5400, 10800
What will come in place of the question mark (?) in the following series?
102, 111, 136, 185, 266, ?
- What will come in place of the question mark (?) in the following series?
1.36, 2.72, 5.44, 10.88, 21.76, ? 120, 130, 145, 165, ?, 220
715 708 694 673 645 ?
Find the missing number in the given number series.
6, 13, 32, 87, ?, 737
289 169 121 ? 25 9
...117, 117, 121, 129, 141, ?
24, 8, 15, ?, 12, 4
15, 23, 30, 36, 41, ?
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