Problem Solving (PS) | Re: Bill purchases an item and receives no change. Before the purchase, he

We have one 5 $ bill, two 10 $ bills and one 20 $ bill.
1) We can have only 5$
2) 5+10= 15$
3) 5+10+10= 25$
4) 10$
5) 10+10= 20$
a) 20$--- redundant
b) 20+5=25$--redundant do not count
6) 20+10= 30$
7) 20+10+5= 35$
8) 20+10+10= 40$
9) 20+10+10+5= 45$

Hence Answer is 9.

Kudos if it helps.

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