In an envelope, there were a total of 36 notes. 75% of them were $1-notes. The rest were $10-notes. Seth took out some $1-notes. As a result, the remaining $1-notes made up 25% of the notes left in the envelope. Find the total value of the $1-notes Seth took out from the envelope.
| |
$1 |
$10 |
Total |
| Before |
3x3 =
9 u |
1x3 =
3 u |
4x3 =
12 u |
| Change |
- ? |
|
|
| After |
1x1 =
1 u |
3x1 =
3 u |
4x1 =
4 u |
75% =
75100 =
34
25% =
25100 =
14
The number of $10-notes remains unchanged. Make the number of $10-notes the same. LCM of 1 and 3 is 3.
Total number of notes at first = 12 u
12 u = 36
1 u = 36 ÷ 12 = 3
Number of $1-notes that Seth took out from the envelope
= 9 u - 1 u
= 8 u
= 8 x 3
= 24
Total value of $1-notes taken out
= 24 x 1
= $24
Answer(s): $24
