Question

Elena and her grandfather both just had birthdays last week. The sum of their ages is 100 years. Her grandfather’s age is 4 times Elena’s age. How old are Elena and her grandfather?

Answer 1

Grandfather age = 20 * 4 = 80

Explanation:

Let Elena age be x

grandfather age is 4x

x + 4x = 100

5x = 100

x = 100/5 = 20 = Elena age