Don't give up, get a clue!
When you feel like giving up, get a clue and keep trying!
Possible combination of numbers that multiply to make 36 when two of the numbers are the same (remember none of the boys got more than 20 pumpkin s-creams):
3 3 4 total = 10
2 2 9 total = 13
1 6 6 total = 13
How could the mum work out the answer straight away after Connor gave her the third clue?