Is the following situation possible? If so, determine their present ages. The sum of the ages of two friends is 20 years. Four years ago, the product of their ages in years was 48.
a) Yes, present ages: 8 years and 12 years
b) Yes, present ages: 6 years and 14 years
c) No, not possible
d) Yes, present ages: 10 years and 10 years
