Present ages of X and Y are in the ratio 4:5 respectively. Five years hence this ratio will become 5:6 respectively. What is X's present age in years?  Choose the correct choice
A) 35  B) 36  C) 37  D) 20  E) 40
Let the present ages of X and Y be 4x and 5x years respectively.   Then, (4x + 5)/(5x + 5) = 5/6   6(4x + 5) = 5(5x + 5) =&gt; 24x+30= 25x+25 =&gt; x =5   X's present age = 4x = 4*5= 
<gadget id="calculator">4*5</gadget>
<output>20</output>
20   ANSWER:20
<result>D</result>
Present ages of X and Y are in the ratio 4:5 respectively. Five years hence this ratio will become 5:6 respectively. What is X's present age in years?