If x/4 years ago Roger was 21 years old and x/4 years from now he will be 4x years old, how old will he be 5x years from now? Choose one:
A) 32 B) 35 C) 30 D) 40 E) 70

Rationale: assume the current age = a a - x / 4 = 28 ( i ) a + x / 4 = 4 x or a = 15 x / 4 ( ii ) putting the value of a from ( ii ) in ( i ) 15 x / 4 - x / 4 = 28 or 14 x / 4 = 28 therefore x = 8 and a = 30 5 x years from now , age will be 30 + 5 * 8 = 70 option e
Answer: E