Question 176804
let r and c be the ages of Ron and Carlo respectively
:
r-9+c-9>28.....eq 1
c=r+6..........eq 2
:
take c's value from eq 2 and plug it into eq 1
:
r-9+r+6-9>28
:
2r-12>28
:
2r>40
:
{{{highlight(r>20)}}}years old.  Rons age is greater than 20 years old