In a pouch of notes, the number of $10, $20 and $50 are in ratio of 5 : 8 : 1.
25 of the $10-notes and 14 $20-notes are taken out. The remaining notes are worth $440. Find the difference between the value of $50-notes and $10-notes in the end.
| |
$10 |
$20 |
$50 |
| Before |
5 u |
8 u |
1 u |
| Change |
- 2 u |
- 14 |
|
| After |
3 u |
8 u - 14 |
1 u |
| |
$10 |
$20 |
$50 |
Total |
| Number |
3 u |
8 u - 14 |
1 u |
|
| Value |
10 |
20 |
50 |
|
| Total value |
30 u |
160 u - 280 |
50 u |
440 |
Total value of the notes
= 30 u + 160 u - 280 + 50 u
= 240 u - 280
240 u - 280 = 440
240 u = 440 + 280
240 u = 720
1 u = 720 ÷ 240 = 3
Difference between the value of $50-notes and $10-notes in the end
= 50 u - 30 u
= 20 u
= 20 x 3
= $60
Answer(s): $60
