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 47 years. What will be the age of the B ten years hence?  Pick one: A) 22 B) 77 C) 94 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 = 47 =&gt; b + c = 94 --- (2)   From (1) and (2), we cannot find b.   Answer: 94
<result>C</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 47 years. What will be the age of the B ten years hence?