PSLE George had 20 more five-dollar notes than ten-dollar notes at first. He exchanged $200 worth of ten-dollar notes for five-dollar notes. How many less ten-dollar notes than five-dollar notes did George have after the exchange?
Number |
$5 |
$10 |
Before |
1 u + 20 |
1 u |
Change |
+ 40 |
- 20 |
After |
1 u + 20 + 40 |
1 u - 20 |
Number of ten-dollar notes that George exchanged into five-dollar notes
= 200 ÷ 10
= 20
Number of five-dollar notes that George received from the exchange
= 200 ÷ 5
= 40
Number of less ten-dollar notes than five-dollar notes
= 20 + 40 + 20
= 80
Answer: 80