P and Q alone can complete a work in 12 days and 18 days respectively. 50% of the work is completed by R alone in 2n days and the remaining work is completed by P and Q working together in n days. Find the time taken by Q and R to complete the whole work, while working together. ...

A container contains 175 liters mixture of acid and water in the ratio of 5:2. If one-fifth of the mixture is taken out and n liters of water is added to the mixture, then the ratio of milk and water becomes 5:3. Find the value of n? ...

Direction: What approximate value should come in the place of (?) in the following questions? Q. 8.12% of 825.35 + 4.72% of 999.91 =? A.116 B.135 C.142 D.154 E. None of these Sol: 8.12% of 825.35 + 4.72% of 999.91 =? => 8% of 825 + 5% of 1000 =? => 66 + 50 =? => 116

34 % of 750 + 1133 ÷ 5.5 × 4 = ? + 182 A.820 B.945 C.650 D.755 E. None of these Sol: 34 % of 750 + 1133 ÷ 5.5 × 4 = x + 182 (34/100) * 750 + (1133 * 10 / 55) * 4 = x + 324 255 + 824 – 324 = x

Direction: What value should come in the place of (?) in the following questions. Q. (3 / 8) ÷ (153 / 64) × 1224 = (2 / 5) of ? A.520 B.535 C.560 D.495 E. None of these Sol: (3 / 8) ÷ (153 / 64) × 1224 = (2 / 5) of x (3 / 8) * (64 / 153) * 1224 = (2x / 5) 192 * (5 / 2) = x x = 480

Direction: What value should come in the place of (?) in the following questions. Q. (3/8) of (2/3) of 72 + 123 – 12 % of 350 = ? +120 A.1584 B.1672 C.1456 D.1328 E. None of these  Sol: (3/8) of (2/3) of 72 + 123 – 12 % of 350 = x + 120 (3/8) * (2/3) * 72 + 1728 – ...

P, Q and R entered into a partnership with an investment of Rs.4500, Rs.6000 and Rs.5000 respectively and after x months, P increased its investment by 20% and Q withdrew Rs.1000 from its investment and at the end of one year, the ratio of the profit obtained by P, Q and R is 72:85:75. Find the ...

A, B and C together can complete a work in 15 days and A alone can complete a work in 45 days and C alone can complete a work in 36 days. If B and C started the work together and B increases its efficiency by 100% and C decreases its efficiency by 40%, then find the time taken by B and C together ...

A bag has 6 black balls, 4 red balls and 8 white balls. If two balls are drawn at random, then find the probability that it contains no black balls. a) 5/8 b) 4/91 c) 1/33 d) 22/51 e) None of these Sol: Number of Non black balls = 4 + 8 = 12 Required probability =12c2/18c2= (12*11) / (18 * 17) ...

Ram invested Rs.4500 in SI at (R + 4)% rate of interest per annum for n years and Jegan invested Rs.7500 in CI at R% rate of interest per annum and after 4 years, the total amount obtained by him is Rs.15552. Find the time period of investment of Ram, if Ram obtained an interest of Rs.5400. ...