Five years ago the average of the ages of A and B was 40 years and now the average of the ages of B and C is 48 years. What will be the age of the B ten years hence?
Select the correct option.
A) 66  B) 77  C) 66  D) 96  E) 51
Let the present ages of A, B and C be a, b and c respectively.   Given, [(a - 5) + (b - 5)] / 2 = 40 =&gt; a + b = 90 --- (1)   (b + c)/2 = 48 =&gt; b + c = 96 --- (2)   From (1) and (2), we cannot find b.   Answer: 96
<result>D</result>
Five years ago the average of the ages of A and B was 40 years and now the average of the ages of B and C is 48 years. What will be the age of the B ten years hence?