Multiple choice

A grandfather's age is 4 years more than nine times the age of the grandson. The father's age of 40 years is 2 years less than six times the age of his son. The age of the grandfather is

  1. 77 years

  2. 67 years

  3. 70 years

  4. 63 years

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

Grandfather's age = 9 × grandson's age + 4. Father's age (40) = 6 × son's age - 2, so son's age = 42/6 = 7 years. Grandfather's age = 9 × 7 + 4 = 63 + 4 = 67 years. The question asks for grandfather's age, not the father's.