PSLE Charlie had 15 more five-dollar notes than fifty-dollar notes at first. He exchanged $450 worth of fifty-dollar notes for five-dollar notes. How many less fifty-dollar notes than five-dollar notes did Charlie have after the exchange?
Number |
$5 |
$50 |
Before |
1 u + 15 |
1 u |
Change |
+ 90 |
- 9 |
After |
1 u + 15 + 90 |
1 u - 9 |
Number of fifty-dollar notes that Charlie exchanged into five-dollar notes
= 450 ÷ 50
= 9
Number of five-dollar notes that Charlie received from the exchange
= 450 ÷ 5
= 90
Number of less fifty-dollar notes than five-dollar notes
= 15 + 90 + 9
= 114
Answer: 114