In an envelope, there were a total of 105 notes. 40% of them were $2-notes. The rest were $10-notes. Xavier took out some $2-notes. As a result, the remaining $2-notes made up 10% of the notes left in the envelope. Find the total value of the $2-notes Xavier took out from the envelope.
|
$2 |
$10 |
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 $10-notes remains unchanged. Make the number of $10-notes the same. LCM of 3 and 9 is 9.
Total number of notes at first = 15 u
15 u = 105
1 u = 105 ÷ 15 = 7
Number of $2-notes that Xavier took out from the envelope
= 6 u - 1 u
= 5 u
= 5 x 7
= 35
Total value of $2-notes taken out
= 35 x 2
= $70
Answer(s): $70