PSLE John had 17 more one-dollar notes than ten-dollar notes at first. He exchanged $90 worth of ten-dollar notes for one-dollar notes. How many less ten-dollar notes than one-dollar notes did John have after the exchange?
Number |
$1 |
$10 |
Before |
1 u + 17 |
1 u |
Change |
+ 90 |
- 9 |
After |
1 u + 17 + 90 |
1 u - 9 |
Number of ten-dollar notes that John exchanged into one-dollar notes
= 90 ÷ 10
= 9
Number of one-dollar notes that John received from the exchange
= 90 ÷ 1
= 90
Number of less ten-dollar notes than one-dollar notes
= 17 + 90 + 9
= 116
Answer: 116