Question
Two pipes A and B can fill a tank in 24 min., and 32
min, respectively. If both the pipes are opened simultaneously, after how much time B should be closed so that the tank is full in 18 minutes?Solution
Let B be closed after x minutes. Then, Part filled by (A+B) in x min. + part filled by A in (18 – x) min. = 1 x (1/24 + 1/32 ) + ( 18 – x ) × 1/24 = 1 ⟹ 7x/96 + (18-x)/24 = 1 ⟹7 x + 4 (18 – x) = 96 ∴ x = 8 ∴ Hence, B must be closed after 8 minutes
850, 849, 841, 814, 750, 688
Find the wrong number in the given number series.
7, 10, 16, 25, 37, 52, 70
12, 18, 40, 90, 270, 945
- Find the wrong number in the given number series.
12, 16, 25, 50, 99, 200 3, 6, 18, 90, 630, 5670
Find the wrong number in the given number series.
8.6, 11.3, 16.7, 24.2, 35.6, 49.1
4, 5, 12, 39, 160, 806
556, 547, 483, 458, 242, 196
Find the wrong number in given series.
1868, 1875, 1883, 1946, 1980, 2185
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