PSLE Ahmad had 11 more two-dollar notes than five-dollar notes at first. He exchanged $80 worth of five-dollar notes for two-dollar notes. How many less five-dollar notes than two-dollar notes did Ahmad have after the exchange?
Number |
$2 |
$5 |
Before |
1 u + 11 |
1 u |
Change |
+ 40 |
- 16 |
After |
1 u + 11 + 40 |
1 u - 16 |
Number of five-dollar notes that Ahmad exchanged into two-dollar notes
= 80 ÷ 5
= 16
Number of two-dollar notes that Ahmad received from the exchange
= 80 ÷ 2
= 40
Number of less five-dollar notes than two-dollar notes
= 11 + 40 + 16
= 67
Answer: 67