In a bag of notes, the number of $5, $20 and $50 are in ratio of 2 : 7 : 3.
12 of the $5-notes and 6 $20-notes are taken out. The remaining notes are worth $1945. Find the difference between the value of $50-notes and $5-notes in the end.
| |
$5 |
$20 |
$50 |
| Before |
2 u |
7 u |
3 u |
| Change |
- 1 u |
- 6 |
|
| After |
1 u |
7 u - 6 |
3 u |
| |
$5 |
$20 |
$50 |
Total |
| Number |
1 u |
7 u - 6 |
3 u |
|
| Value |
5 |
20 |
50 |
|
| Total value |
5 u |
140 u - 120 |
150 u |
1945 |
Total value of the notes
= 5 u + 140 u - 120 + 150 u
= 295 u - 120
295 u - 120 = 1945
295 u = 1945 + 120
295 u = 2065
1 u = 2065 ÷ 295 = 7
Difference between the value of $50-notes and $5-notes in the end
= 150 u - 5 u
= 145 u
= 145 x 7
= $1015
Answer(s): $1015
