Three years ago, the average age of 6 members was 19. Find the present age of a boy. A. 1 year B. 1.5 years C. 2 years D. 2.5 years Explanation: Total age difference method.
Pipes A, B, C fill tank in 12, 15, 20 houRs. If A alone works, time required is ____. A. 6 hrs B. 6⅔ hrs C. 7 hrs D. 7½ hrs Explanation: Based on the given combination.
Pipes A, B, C fill tank in 12, 15, 20 houRs. Find time together. A. 6 hours B. 6⅔ hours C. 7 hours D. 7½ hours Explanation: Combined rate method.
Three pipes of equal capacity fill a tank in 8 houRs. Two pipes will take ____. A. 17 hours B. 12 hours C. 16 hours D. 24 hours Explanation: Work is inversely proportional.
Three pipes fill a tank in 6 houRs. After 2 hours, one is closed. Remaining time is ____. A. 10 B. 12 C. 14 D. 16 Explanation: Work-rate adjustment.
Three pipes, A, B, and C, fill the tank in 30, 20, and 15 minutes, respectively. Together they fill in ____. A. 5/11 B. 6/11 C. 7/11 D. 8/11 Explanation: Combined rate calculation.
Three persons invest Rs. 9000. Second invests Rs. 3000. Profit share of first is ____. A. Rs. 2400 B. Rs. 3600 C. Rs. 2850 D. Rs. 2000 Explanation: Profit shares are proportional to investment.
Three numbers are co-prime. The product of the first two is 551. Find the third. A. 75 B. 81 C. 85 D. 89 Explanation: Factorization approach.
Three men walk around a circular track of 11 km. Find a time for them to meet again. A. 11 hours B. 12 hours C. 220 hours D. 22 hours Explanation: LCM of time intervals.
Three flags of different coloRs. Number of signals using 1 or more flags is ____. A. 6 B. 9 C. 15 D. 18 Explanation: Total combinations excluding empty = 2³ −1.