In a bag of notes, the number of $5, $20 and $50 are in ratio of 5 : 7 : 7.
35 of the $5-notes and 3 $20-notes are taken out. The remaining notes are worth $3440. Find the difference between the value of $50-notes and $5-notes in the end.
| |
$5 |
$20 |
$50 |
| Before |
5 u |
7 u |
7 u |
| Change |
- 3 u |
- 3 |
|
| After |
2 u |
7 u - 3 |
7 u |
| |
$5 |
$20 |
$50 |
Total |
| Number |
2 u |
7 u - 3 |
7 u |
|
| Value |
5 |
20 |
50 |
|
| Total value |
10 u |
140 u - 60 |
350 u |
3440 |
Total value of the notes
= 10 u + 140 u - 60 + 350 u
= 500 u - 60
500 u - 60 = 3440
500 u = 3440 + 60
500 u = 3500
1 u = 3500 ÷ 500 = 7
Difference between the value of $50-notes and $5-notes in the end
= 350 u - 10 u
= 340 u
= 340 x 7
= $2380
Answer(s): $2380
