Question

A is 7yrs older than B. After 4yrs, age of B will be half of that of A. The sum of their present ages ( in years ) is
A. 19
B. 17
C. 15
D. 13

Please give me a proper solution

Answer 1

A=B+7
AFTER 4 YEARS B IS HALF OF A
(A+4)/2=B+4
B+7+4=2B+8
B=3
A=10
SUM=13