Min had an equal number of $5 and $10 notes. After spending 48 pieces of $10 and 36 pieces of $5 notes, the ratio of the $5 notes to $10 notes left was 5 : 2. Find the value of the notes left.
| |
$5 |
$10 |
| Before |
5 u + 36 |
2 u + 48 |
| Change |
- 36 |
- 48 |
| After |
5 u |
2 u |
Number of $5 notes at first = 5 u + 36
Number of $10 notes at first = 2 u + 48
The number of $5 and $10 notes at first is the same.
5 u + 36 = 2 u + 48
5 u - 2 u = 48 - 36
3 u = 12
1 u = 12 ÷ 3 = 4
Value of $5-notes left
= 5 u x 5
= 5 x 4 x 5
= $100
Value of $10-notes left
= 2 u x 10
= 2 x 4 x 10
= $80
Value of notes left
= 100 + 80
= $180
Answer(s): $180
