How old are berthas cousins?

Question

Berthas two cousins are coming for a visit. How old are they? Asks Eggbert. "Well" says Bertha,"the sum of their ages is 48. The age of the younger is three more than half the age of the older." How old are Berthas cousins.

Answer 1

Y+O=48

Y=O/2+3

48-O=O/2+3

45=3O/2

30=O

Y=18