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ATQ, Let the total work be 60 units. Efficiency of 'Sita' = 60 ÷ 20 = 3 units/day Efficiency of 'Geeta' = 3 X 3 = 9 units/day Efficiency of 'Reeta' = 9 ÷ 2 = 4.5 units/day Let the number of days for which 'Geeta' worked alone be 'd'. So, (d X 9) + (8 - d) X (3 + 4.5) = 60 Or, 9d + 52.5 - 7.5d = 60 Or, 'd' = 3 So, 'Geeta' worked alone for 3 days 'Geeta' should've joined them after (8 - 3) = 5 days
2, 6, 14, 30, 134, 614
9 20 63 255 1285 7716
...120, 140, 178, 232, 300, 360
259, 372, 495, 618, 741, 864
Find the wrong number in given number series.
3080, 3058, 3016, 2934, 2772, 2460
29, 36, 59, 74, 105, 144
Find the wrong number in given number series.
3910, 3879, 3786, 3631, 3414, 3235.
24, 72, 36, 112, 54, 162
6, 22, 76, 314, 1580, 9600