Question

The math teacher asked Edith, “How old are you?” “Sixty years less than five times my brother’s age,” she answered. “That doesn’t help me,” replied the teacher. “Yes, it does,” said Edith, “He and I are twins!” How old is Edith?

Answer 1

Edith is 15 years old and so is her twin brother. Hope this helps!

Answer 2

15 years

Explanation:

Let e represent Edith's age. Then e also represents her brother's age.

Then:

e = 5e - 60.

Consolidating the e terms, we get 60 = 4e. Thus, e = 15.

Edith is 15 years old. So is her brother.