In an envelope, there were a total of 405 notes. 60% of them were $100-notes. The rest were $10-notes. Harry took out some $100-notes. As a result, the remaining $100-notes made up 10% of the notes left in the envelope. Find the total value of the $100-notes Harry took out from the envelope.
| |
$100 |
$10 |
Total |
| Before |
3x9 =
27 u |
2x9 =
18 u |
5x9 =
45 u |
| Change |
- ? |
|
|
| After |
1x2 =
2 u |
9x2 =
18 u |
10x2 =
20 u |
60% =
60100 =
35
10% =
10100 =
110
The number of $10-notes remains unchanged. Make the number of $10-notes the same. LCM of 2 and 9 is 18.
Total number of notes at first = 45 u
45 u = 405
1 u = 405 ÷ 45 = 9
Number of $100-notes that Harry took out from the envelope
= 27 u - 2 u
= 25 u
= 25 x 9
= 225
Total value of $100-notes taken out
= 225 x 100
= $22500
Answer(s): $22500
