PSLE Andy had 11 more two-dollar notes than ten-dollar notes at first. He exchanged $70 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 + 11 |
1 u |
Change |
+ 35 |
- 7 |
After |
1 u + 11 + 35 |
1 u - 7 |
Number of ten-dollar notes that Andy exchanged into two-dollar notes
= 70 ÷ 10
= 7
Number of two-dollar notes that Andy received from the exchange
= 70 ÷ 2
= 35
Number of less ten-dollar notes than two-dollar notes
= 11 + 35 + 7
= 53
Answer: 53