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Work done by A and B in 1 day = (1/12 + 1/15) = 5/60 + 4/60 = 9/60 = 3/20. Work completed by A and B together in 4 days = 4 * (3/20) = 12/20 = 3/5. Remaining work = 1 - 3/5 = 2/5. Work done by B in 1 day = 1/15. Time taken by B to complete 2/5 of the work = (2/5) ÷ (1/15) = (2/5) * 15 = 6 days. Correct Option: a
The ratio of A and B present age is 9:4. The product of their ages is 3600. What will be the ratio of their ages after 5 years?
A 15-member group has two individuals aged 18 and 23. When excluded, the average age of the rest increases by 3 years. Find the average age of all members.
The ratio of the present ages of P and Q is 6:5 respectively. If the age of P 12 years hence from now will be 125% more than the age of Q 4 years ago fr...
The present age of Preeti is twice Ruchi’s present age. Six years ago, their average age was 15 years. What will be the Preeti’s age after f...
B is 4 years older than A and A is 8 years older than C. If the sum of the age of A and C is 22 years, then find the sum of the ages of all three.
C is three years older than B, while ratio of age of A to that of B four years ago was 3: 5. If age of A eight years later will be equal to the age of C...
18 years ago the average age of a family of four members was 45 years. Two children were born in that span of 18 years. The present average age of the f...
Present age of ‘A’ is 40% more than that of ‘B’. If 11 years hence from now, ‘B’ will be 5 years younger than ‘A’, then find the sum of ...
12 years ago, the ratio of the ages of Ivan and Jenny was 2:1. The present age of Carl is 18 years more than one-sixth of Jenny’s present age. Find th...
Twelve years from now, the combined ages of A and B will be 94 years. Eight years ago, the ratio of the total of A and B's ages to the age of C was 3:2...
