PSLE Ivan had 17 more two-dollar notes than ten-dollar notes at first. He exchanged $90 worth of ten-dollar notes for two-dollar notes. How many more two-dollar notes than ten-dollar notes did Ivan have after the exchange?
Number |
$2 |
$10 |
Before |
1 u + 17 |
1 u |
Change |
+ 45 |
- 9 |
After |
1 u + 17 + 45 |
1 u - 9 |
Number of ten-dollar notes that Ivan exchanged into two-dollar notes
= 90 ÷ 10
= 9
Number of two-dollar notes that Ivan received from the exchange
= 90 ÷ 2
= 45
Number of more two-dollar notes than ten-dollar notes
= 17 + 45 + 9
= 71
Answer: 71