Oral contraceptive pills should not be prescribed to the woman at what age ?
a)<20 years
b)>40 years
c)>30 years
d) none of these
A"s age is six times that of B"s age. 15 years hence, A will be three times as old as B. Find A's age.
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.