In an envelope, there were a total of 105 notes. 80% of them were $5-notes. The rest were $1-notes. Daniel took out some $5-notes. As a result, the remaining $5-notes made up 30% of the notes left in the envelope. Find the total value of the $5-notes Daniel took out from the envelope.
| |
$5 |
$1 |
Total |
| Before |
4x7 =
28 u |
1x7 =
7 u |
5x7 =
35 u |
| Change |
- ? |
|
|
| After |
3x1 =
3 u |
7x1 =
7 u |
10x1 =
10 u |
80% =
80100 =
45
30% =
30100 =
310
The number of $1-notes remains unchanged. Make the number of $1-notes the same. LCM of 1 and 7 is 7.
Total number of notes at first = 35 u
35 u = 105
1 u = 105 ÷ 35 = 3
Number of $5-notes that Daniel took out from the envelope
= 28 u - 3 u
= 25 u
= 25 x 3
= 75
Total value of $5-notes taken out
= 75 x 5
= $375
Answer(s): $375
