In an envelope, there were a total of 90 notes. 70% of them were $100-notes. The rest were $1-notes. Ahmad took out some $100-notes. As a result, the remaining $100-notes made up 25% of the notes left in the envelope. Find the total value of the $100-notes Ahmad took out from the envelope.
| |
$100 |
$1 |
Total |
| Before |
7x1 =
7 u |
3x1 =
3 u |
10x1 =
10 u |
| Change |
- ? |
|
|
| After |
1x1 =
1 u |
3x1 =
3 u |
4x1 =
4 u |
70% =
70100 =
710
25% =
25100 =
14
The number of $1-notes remains unchanged. Make the number of $1-notes the same. LCM of 3 and 3 is 3.
Total number of notes at first = 10 u
10 u = 90
1 u = 90 ÷ 10 = 9
Number of $100-notes that Ahmad took out from the envelope
= 7 u - 1 u
= 6 u
= 6 x 9
= 54
Total value of $100-notes taken out
= 54 x 100
= $5400
Answer(s): $5400
