Question
Two pipes A and B can fill a cistern in Â
src='https://static.ixambee.com/public/images/quesimg/SSC CHSL Tier 1/Quantitative Aptitude/Pipes and cisterns/20980_4373803.gif'> Â minutes and 35 minutes respectively. Both pipes are opened. The cistern will be filled in just 25 minutes, if the pipe B is turned off after?Solution
Let the pipe B be turned off after x minutes. Then, Part filled by (A + B) in x minutes + Part filled by A in (25 - x) minutes = 1 ∴ x (2/55- 1/35) + (25 - x) × 2/55 =1 x/35 = 1 - 50/55 ∴ x = 35/11 or 3*2/11 minutes Alternate method: Let total capacity of cistern = LCM(55/2, 35 ) = 385 L So A can fill in 1 min = 385/27.5 = 14L & B can fill in 1 min = 385/35 = 11L Now B is left in between , it means A is opened all time So in 25 min, A can fill = 14×25 = 350 So remaining tank = 385 -350 = 35L So B can do it in = 35/11 = 3*2/11min So B is turned off = 3*2/11min
What value should come in the place of (?) in the following number series?
7, 16, ?, 137, 560, 2813
- What will come in place of (?) in the given number series.
7, 14, 28, 56, ?, 224 15, 90, 95, ?, 383, 766Â Â
196, 167, 144, ?, 108, 95
What will come in place of the question mark (?) in the following series?
206, 187, ?, 157, 146, 139
In each of the following number series, one term is missing. Find the missing term.
5, 7, 12, 22, 39, 65, ?
18, 37, 60, ?, 120, 157
24  12  18  ?  157.5  708.75  3,898.125
30, 42, 54, 66, ?, 90
10, 10, 15, 30, 75, ?
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