PSLE Tommy had 10 more two-dollar notes than five-dollar notes at first. He exchanged $30 worth of five-dollar notes for two-dollar notes. How many more two-dollar notes than five-dollar notes did Tommy have after the exchange?
Number |
$2 |
$5 |
Before |
1 u + 10 |
1 u |
Change |
+ 15 |
- 6 |
After |
1 u + 10 + 15 |
1 u - 6 |
Number of five-dollar notes that Tommy exchanged into two-dollar notes
= 30 ÷ 5
= 6
Number of two-dollar notes that Tommy received from the exchange
= 30 ÷ 2
= 15
Number of more two-dollar notes than five-dollar notes
= 10 + 15 + 6
= 31
Answer: 31