The present ages of Reena and Usha are 24 and 36 yr. respectively . What was the ratio between the ages of Usha and Reena respectively 8 yr ago ?
Choose the most appropriate option.
A) 7 : 4 B) 4 : 7 C) 11 : 8 D) 8 : 11 E) 9 : 12

Rationale: required ratio = ( 36 - 8 ) / ( 24 - 8 ) = 28 / 16 = 7 : 4 answer : a
Answer: A