In an envelope, there were a total of 495 notes. 20% of them were $1-notes. The rest were $50-notes. Cody 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 Cody took out from the envelope.
| |
$1 |
$50 |
Total |
| Before |
1x9 =
9 u |
4x9 =
36 u |
5x9 =
45 u |
| Change |
- ? |
|
|
| After |
1x4 =
4 u |
9x4 =
36 u |
10x4 =
40 u |
20% =
20100 =
15
10% =
10100 =
110
The number of $50-notes remains unchanged. Make the number of $50-notes the same. LCM of 4 and 9 is 36.
Total number of notes at first = 45 u
45 u = 495
1 u = 495 ÷ 45 = 11
Number of $1-notes that Cody took out from the envelope
= 9 u - 4 u
= 5 u
= 5 x 11
= 55
Total value of $1-notes taken out
= 55 x 1
= $55
Answer(s): $55
