Multiple choice general knowledge math & puzzles

John is twice as old as his friend Peter. Peter is 5 years older than Alice. In 5 years, John will be three times as old as Alice. How old is Peter now?

  1. 3

  2. 5

  3. 7

  4. 9

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let Alice = x, Peter = x+5, John = 2(x+5). In 5 years: John+5 = 3(Alice+5) -> 2x+10+5 = 3x+15 -> 2x+15 = 3x+15 -> x=0. If Alice is 0, Peter is 5. John (10) will be 15, Alice (0) will be 5. 15 is 3x5.