i checked the answer and its 20 but the closest i've gotten to is 12How many different amounts can be made up using three of the six coins: 5 cents, 10 cents, 20 cents, 50 cents, $1, $2

Update:dw solved

1)5c+10c+20c

2)5c+10c+50c

3)5c+10c+$1

4)5c+10c+$2

5)5c+20c+50c

6)5c+20c+$1

7)5c+20c+$2

8)5c+50c+$1

9)5c+50c+$2

10)5c+$1+$2

11)10c+20c+50c

12)10c+20c+$1

13)10c+20c+$2

14)10c+50c+$1

15)10c+50c+$2

16)10c+$1+$2

17)20c+50c+$1

18)20c+50c+$2

19)20c+$1+$2

20)50c+$1+$2