Question

Five years ago I was thrice as old as my son and ten years later I shall be twice as old as my son. How old are we now?

• A. 30 & 40
• B. 40& 15
• C. 35 & 15
• D. 50 &20

Answer 1

Answer:

D. 50 &20

let x=son's age now 5 yrs ago: x-5 = son's age 3(x-5) = parent's age 10 yrs later: x+10 = son's age 2(x+10) = parent's age parent's age 10 yrs later = parent's age 5 yrs ago + 15 2(x+10)=15+3(x-5) 2x+20=15+3x-15 x=20 3(x-5)+5=50 son's age now: 20 parent's age now: 50