In an envelope, there were a total of 150 notes. 70% of them were $50-notes. The rest were $1-notes. Rael took out some $50-notes. As a result, the remaining $50-notes made up 10% of the notes left in the envelope. Find the total value of the $50-notes Rael took out from the envelope.
|
$50 |
$1 |
Total |
Before |
7x3 = 21 u |
3x3 = 9 u |
10x3 = 30 u |
Change |
- ? |
|
|
After |
1x1 = 1 u |
9x1 = 9 u |
10x1 = 10 u |
70% =
70100 =
710
10% =
10100 =
110
The number of $1-notes remains unchanged. Make the number of $1-notes the same. LCM of 3 and 9 is 9.
Total number of notes at first = 30 u
30 u = 150
1 u = 150 ÷ 30 = 5
Number of $50-notes that Rael took out from the envelope
= 21 u - 1 u
= 20 u
= 20 x 5
= 100
Total value of $50-notes taken out
= 100 x 50
= $5000
Answer(s): $5000