Question

Eric is 8 years 4 months old. his mother is 40 years 3 months old. how old was his mother when eric was born?

Answer 1

Eric´s mom had:

31 years 11 months

Explanation:

1 year = 12 months

40 years = 39 years + 12 months

40 years 3 months = 39 years + 12 monts + 3 monts = 39 years 15 months

Then:

40 years 3 months

- 8 years 4 months

it´s equivalent to:

39 years 15 months

- 8 years 4 months

= 31 years 11 monts