Zara had an equal number of $5 and $10 notes. After spending 41 pieces of $10 and 39 pieces of $5 notes, the ratio of the $5 notes to $10 notes left was 5 : 3. Find the value of the notes left.
|
$5 |
$10 |
Before |
5 u + 39 |
3 u + 41 |
Change |
- 39 |
- 41 |
After |
5 u |
3 u |
Number of $5 notes at first = 5 u + 39
Number of $10 notes at first = 3 u + 41
The number of $5 and $10 notes at first is the same.
5 u + 39 = 3 u + 41
5 u - 3 u = 41 - 39
2 u = 2
1 u = 2 ÷ 2 = 1
Value of $5-notes left
= 5 u x 5
= 5 x 1 x 5
= $25
Value of $10-notes left
= 3 u x 10
= 3 x 1 x 10
= $30
Value of notes left
= 25 + 30
= $55
Answer(s): $55