present ages of A and B are in the ratio of 5:4 respectively. 5 years ago, the ratio of their ages was 4:3 respectively . what A's age in 5 year ago in years?
Choices.
A) 27 B) 24 C) 40 D) 32 E) 20
A and B be 5x years and 4x years respectively   (5x-5)/(4x-5)=4/3   3(5x-5)= 4(4x-5), 15x-15=16x-20   x=5, therefore A's present age : 5x=25 years   A's age in 5 years ago = 25 - 5= 
<gadget id="calculator">25 - 5</gadget>
<output>20</output>
20   correct answer(20)
<result>E</result>
present ages of A and B are in the ratio of 5:4 respectively. 5 years ago, the ratio of their ages was 4:3 respectively . what A's age in 5 year ago in years?