Multiple choice general knowledge math & puzzles

Grandpa: "My grandson is about as many days as my son is weeks, and my grandson is as many months as I am in years. My grandson, my son and I together are 160 years. Can you tell me my age in years?"

  1. 98

  2. 96

  3. 94

  4. 92

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

Let grandson be G, son be S, and grandpa be A. G = S/7 (days to weeks), G = A/12 (months to years). Thus S=7G and A=12G. G + 7G + 12G = 160; 20G = 160; G=8. Grandpa's age is 12 * 8 = 96.