PSLE Fabian had 20 more five-dollar notes than ten-dollar notes at first. He exchanged $180 worth of ten-dollar notes for five-dollar notes. How many less ten-dollar notes than five-dollar notes did Fabian have after the exchange?
Number |
$5 |
$10 |
Before |
1 u + 20 |
1 u |
Change |
+ 36 |
- 18 |
After |
1 u + 20 + 36 |
1 u - 18 |
Number of ten-dollar notes that Fabian exchanged into five-dollar notes
= 180 ÷ 10
= 18
Number of five-dollar notes that Fabian received from the exchange
= 180 ÷ 5
= 36
Number of less ten-dollar notes than five-dollar notes
= 20 + 36 + 18
= 74
Answer: 74