The ratio between A and B’s present age is 4:5. If the ratio of their ages 5 years ago was 3:4, find the present age of B.
15 years
20 years
25 years
35 years
30 years
AB=45,A−5B−5=34⇒B=25 Years.
The ages of A and B are in the ratio 5 : 7. Four years from now the ratio of their ages will be 3 : 4. The present age of B is
(a) 20 years
(b) 28 years
(c) 15 years
(d) 21 years