In an envelope, there were a total of 60 notes. 40% of them were $5-notes. The rest were $1-notes. Ivan took out some $5-notes. As a result, the remaining $5-notes made up 20% of the notes left in the envelope. Find the total value of the $5-notes Ivan took out from the envelope.
| |
$5 |
$1 |
Total |
| Before |
2x4 =
8 u |
3x4 =
12 u |
5x4 =
20 u |
| Change |
- ? |
|
|
| After |
1x3 =
3 u |
4x3 =
12 u |
5x3 =
15 u |
40% =
40100 =
25
20% =
20100 =
15
The number of $1-notes remains unchanged. Make the number of $1-notes the same. LCM of 3 and 4 is 12.
Total number of notes at first = 20 u
20 u = 60
1 u = 60 ÷ 20 = 3
Number of $5-notes that Ivan took out from the envelope
= 8 u - 3 u
= 5 u
= 5 x 3
= 15
Total value of $5-notes taken out
= 15 x 5
= $75
Answer(s): $75
