In a box of notes, the number of $5, $20 and $50 are in ratio of 5 : 8 : 5.
35 of the $5-notes is taken out and another 8 $20-notes are added. The remaining notes are worth $1840. Find the difference between the value of $50-notes and $5-notes in the end.
| |
$5 |
$20 |
$50 |
| Before |
5 u |
8 u |
5 u |
| Change |
- 3 u |
+ 8 |
|
| After |
2 u |
8 u + 8 |
5 u |
| |
$5 |
$20 |
$50 |
Total |
| Number |
2 u |
8 u + 8 |
5 u |
|
| Value |
5 |
20 |
50 |
|
| Total value |
10 u |
160 u + 160 |
250 u |
1840 |
Total value of the notes
= 10 u + 160 u + 160 + 250 u
= 420 u + 160
420 u + 160 = 1840
420 u = 1840 - 160
420 u = 1680
1 u = 1680 ÷ 420 = 4
Difference between the value of $50-notes and $5-notes in the end
= 250 u - 10 u
= 240 u
= 240 x 4
= $960
Answer(s): $960
