quantitative aptitude
Pipes A and B can fill a tank in 20 hours and 30 hours respectively while pipe C can empty the full tank in 40 hours

Pipes A and B can fill a tank in 20 hours and 30 hours respectively while pipe C can empty the full tank in 40 hours. All are opened together, after 12 hours, pipe C closed. Find the time taken to fill the whole tank? A.            16 hours 24 mins B.            14 hours 48 mins C.            15 ...

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256, 240, 218, 179, 130, 66

Find out the wrong number in the following number series. Q. 256, 240, 218, 179, 130, 66 A. 218 B. 66 C. 179 D. 240 E. 130 Sol: 256 – 42 = 240 240 – 52 = 215 215 – 62 = 179 179 – 72 = 130 130 – 82 = 66

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19, 99, 219, 353, 535, 759

Find out the wrong number in the following number series. Q. 19, 99, 219, 353, 535, 759 A. 99 B. 535 C. 759 D. 353 E. 219 Sol: 19 + (20 * 4) = 99 99 + (22 * 5) = 209 209 + (24 * 6) = 353 353 + (26 * 7) = 535 535 + (28 * 8) = 759

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24, 47, 78, 117, 164, 220

Find out the wrong number in the following number series. Q. 24, 47, 78, 117, 164, 220 A. 164 B. 78 C. 220 D. 117 E. 47 Sol: 52 – 1 = 24 72 – 2 = 47 92 – 3 = 78 112 – 4 = 117 132 – 5 = 164 152 – 6 = 219

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