In an envelope, there were a total of 420 notes. 40% of them were $1-notes. The rest were $2-notes. Wesley took out some $1-notes. As a result, the remaining $1-notes made up 30% of the notes left in the envelope. Find the total value of the $1-notes Wesley took out from the envelope.
| |
$1 |
$2 |
Total |
| Before |
2x7 =
14 u |
3x7 =
21 u |
5x7 =
35 u |
| Change |
- ? |
|
|
| After |
3x3 =
9 u |
7x3 =
21 u |
10x3 =
30 u |
40% =
40100 =
25
30% =
30100 =
310
The number of $2-notes remains unchanged. Make the number of $2-notes the same. LCM of 3 and 7 is 21.
Total number of notes at first = 35 u
35 u = 420
1 u = 420 ÷ 35 = 12
Number of $1-notes that Wesley took out from the envelope
= 14 u - 9 u
= 5 u
= 5 x 12
= 60
Total value of $1-notes taken out
= 60 x 1
= $60
Answer(s): $60
