Answer:
$21, $31 and $100
Step-by-step explanation:
He could have all of the amounts that are greater than $20 (not that he CAN'T have $20 as the statement says he has MORE than $20).
7 < 20, so he cannot have $7
31 > 20, so he can have $31
20 = 20, so he cannot have $20
21 > 20, so he can have $21
12 < 20, so he cannot have $12
100 > 20, so he can have $100
So, he can have the following amounts: $21, $31 and $100
