In an envelope, there were a total of 280 notes. 60% of them were $50-notes. The rest were $5-notes. Perry took out some $50-notes. As a result, the remaining $50-notes made up 30% of the notes left in the envelope. Find the total value of the $50-notes Perry took out from the envelope.
| |
$50 |
$5 |
Total |
| Before |
3x7 =
21 u |
2x7 =
14 u |
5x7 =
35 u |
| Change |
- ? |
|
|
| After |
3x2 =
6 u |
7x2 =
14 u |
10x2 =
20 u |
60% =
60100 =
35
30% =
30100 =
310
The number of $5-notes remains unchanged. Make the number of $5-notes the same. LCM of 2 and 7 is 14.
Total number of notes at first = 35 u
35 u = 280
1 u = 280 ÷ 35 = 8
Number of $50-notes that Perry took out from the envelope
= 21 u - 6 u
= 15 u
= 15 x 8
= 120
Total value of $50-notes taken out
= 120 x 50
= $6000
Answer(s): $6000
