PSLE Albert had 18 more two-dollar notes than ten-dollar notes at first. He exchanged $200 worth of ten-dollar notes for two-dollar notes. How many less ten-dollar notes than two-dollar notes did Albert have after the exchange?
Number |
$2 |
$10 |
Before |
1 u + 18 |
1 u |
Change |
+ 100 |
- 20 |
After |
1 u + 18 + 100 |
1 u - 20 |
Number of ten-dollar notes that Albert exchanged into two-dollar notes
= 200 ÷ 10
= 20
Number of two-dollar notes that Albert received from the exchange
= 200 ÷ 2
= 100
Number of less ten-dollar notes than two-dollar notes
= 18 + 100 + 20
= 138
Answer: 138