PSLE Mark had 14 more two-dollar notes than five-dollar notes at first. He exchanged $50 worth of five-dollar notes for two-dollar notes. How many less five-dollar notes than two-dollar notes did Mark have after the exchange?
Number |
$2 |
$5 |
Before |
1 u + 14 |
1 u |
Change |
+ 25 |
- 10 |
After |
1 u + 14 + 25 |
1 u - 10 |
Number of five-dollar notes that Mark exchanged into two-dollar notes
= 50 ÷ 5
= 10
Number of two-dollar notes that Mark received from the exchange
= 50 ÷ 2
= 25
Number of less five-dollar notes than two-dollar notes
= 14 + 25 + 10
= 49
Answer: 49