In an envelope, there were a total of 700 notes. 70% of them were $50-notes. The rest were $10-notes. Glen took out some $50-notes. As a result, the remaining $50-notes made up 30% of the notes left in the envelope. Find the total value of the $50-notes Glen took out from the envelope.
|
$50 |
$10 |
Total |
Before |
7x7 = 49 u |
3x7 = 21 u |
10x7 = 70 u |
Change |
- ? |
|
|
After |
3x3 = 9 u |
7x3 = 21 u |
10x3 = 30 u |
70% =
70100 =
710
30% =
30100 =
310
The number of $10-notes remains unchanged. Make the number of $10-notes the same. LCM of 3 and 7 is 21.
Total number of notes at first = 70 u
70 u = 700
1 u = 700 ÷ 70 = 10
Number of $50-notes that Glen took out from the envelope
= 49 u - 9 u
= 40 u
= 40 x 10
= 400
Total value of $50-notes taken out
= 400 x 50
= $20000
Answer(s): $20000