Question 553499
Let her son be s years old. She is s + 33 years old.

In four years time this becomes s + 4 and s + 37.

so, 4(s + 4) = s + 37

=> 4s + 16 = s + 37

=> 3s = 21

so, s = 7

i.e. their ages are 7 and 40.