PSLE Andy had 20 more two-dollar notes than ten-dollar notes at first. He exchanged $110 worth of ten-dollar notes for two-dollar notes. How many less ten-dollar notes than two-dollar notes did Andy have after the exchange?
Number |
$2 |
$10 |
Before |
1 u + 20 |
1 u |
Change |
+ 55 |
- 11 |
After |
1 u + 20 + 55 |
1 u - 11 |
Number of ten-dollar notes that Andy exchanged into two-dollar notes
= 110 ÷ 10
= 11
Number of two-dollar notes that Andy received from the exchange
= 110 ÷ 2
= 55
Number of less ten-dollar notes than two-dollar notes
= 20 + 55 + 11
= 86
Answer: 86