The ages of two persons differ by 20 years. If 5 years ago, the elder one be 5 times as old as the younger one, their present ages (in years) are respectively  Choose the most appropriate option.
A) 11 years B) 77 years C) 88 years D) 10 years E) 66 years
Let their ages be x and (x + 20) years.   5 (x - 5) = (x + 20 - 5) or 4x = 40 or x = 10.   Their present ages are 30 years and 10 years   Answer: 10 years
<result>D</result>
The ages of two persons differ by 20 years. If 5 years ago, the elder one be 5 times as old as the younger one, their present ages (in years) are respectively