x = % of Rahul' son = x +3 CP = = = 33 = 37.5 Rs. = 12x = 99 3 = 96 – 37. (D) Let amound = 99x x = 8 Initially amount was distributed in Required difference ratio = (7 × 8) (8 + 3) – = x : y : z = 1 : 3 : 5 = 45 Amount received by Y = 33x 39. (C) Let speed of first and second trains in After erroneous distribution, amount m/sec be 2x and 3x was distributed in ratio sum of the length of train and = x : y : z = 2 : 3 : 6 second train Amount got by y after erroneous = 180 + 270 distribution = 27x = 450 m Amount lost by y = Rs. 60 sum of their speeds = 2x = 3x = = 33x 27x – 5x = m/s = 60 x = m/s x = 10 Time taken by second train Amount = 99 × 10 = = 990 = 38. (A) Let age of Rahul's father = 7x = 54 seconds Age of Rahul = = 4x 40. (E) Let Rakesh's investment = x Age of 3 year ago Ram investment = 31500 = = x
x = CP = = 37.5 Rs. 37. (D) Let amound = 99x Initially amount was distributed in ratio = x : y : z = 1 : 3 : 5 Amount received by Y = 33x After erroneous distribution, amount was distributed in ratio = x : y : z = 2 : 3 : 6 Amount got by y after erroneous distribution = 27x Amount lost by y = Rs. 60 = 33x – 27x = 60 x = 10 Amount = 99 × 10 = 990 38. (A) Let age of Rahul's father = 7x Age of Rahul = = 4x Age of 3 year ago = = x % of Rahul' son = x +3 = = 33 = 12x = 99 – 3 = 96 x = 8 Required difference = (7 × 8) – (8 + 3) = 45 39. (C) Let speed of first and second trains in m/sec be 2x and 3x sum of the length of train and second train = 180 + 270 = 450 m sum of their speeds = 2x = 3x = 5x = m/s x = m/s Time taken by second train = = = 54 seconds 40. (E) Let Rakesh's investment = x Ram investment = 31500