In an envelope, there were a total of 150 notes. 40% of them were $1-notes. The rest were $2-notes. Owen took out some $1-notes. As a result, the remaining $1-notes made up 10% of the notes left in the envelope. Find the total value of the $1-notes Owen took out from the envelope.
| |
$1 |
$2 |
Total |
| Before |
2x3 =
6 u |
3x3 =
9 u |
5x3 =
15 u |
| Change |
- ? |
|
|
| After |
1x1 =
1 u |
9x1 =
9 u |
10x1 =
10 u |
40% =
40100 =
25
10% =
10100 =
110
The number of $2-notes remains unchanged. Make the number of $2-notes the same. LCM of 3 and 9 is 9.
Total number of notes at first = 15 u
15 u = 150
1 u = 150 ÷ 15 = 10
Number of $1-notes that Owen took out from the envelope
= 6 u - 1 u
= 5 u
= 5 x 10
= 50
Total value of $1-notes taken out
= 50 x 1
= $50
Answer(s): $50
