PSLE David had 15 more two-dollar notes than fifty-dollar notes at first. He exchanged $800 worth of fifty-dollar notes for two-dollar notes. How many more two-dollar notes than fifty-dollar notes did David have after the exchange?
Number |
$2 |
$50 |
Before |
1 u + 15 |
1 u |
Change |
+ 400 |
- 16 |
After |
1 u + 15 + 400 |
1 u - 16 |
Number of fifty-dollar notes that David exchanged into two-dollar notes
= 800 ÷ 50
= 16
Number of two-dollar notes that David received from the exchange
= 800 ÷ 2
= 400
Number of more two-dollar notes than fifty-dollar notes
= 15 + 400 + 16
= 431
Answer: 431