In an envelope, there were a total of 245 notes. 40% of them were $1-notes. The rest were $50-notes. Brandon took out some $1-notes. As a result, the remaining $1-notes made up 30% of the notes left in the envelope. Find the total value of the $1-notes Brandon took out from the envelope.
|
$1 |
$50 |
Total |
Before |
2x7 = 14 u |
3x7 = 21 u |
5x7 = 35 u |
Change |
- ? |
|
|
After |
3x3 = 9 u |
7x3 = 21 u |
10x3 = 30 u |
40% =
40100 =
25
30% =
30100 =
310
The number of $50-notes remains unchanged. Make the number of $50-notes the same. LCM of 3 and 7 is 21.
Total number of notes at first = 35 u
35 u = 245
1 u = 245 ÷ 35 = 7
Number of $1-notes that Brandon took out from the envelope
= 14 u - 9 u
= 5 u
= 5 x 7
= 35
Total value of $1-notes taken out
= 35 x 1
= $35
Answer(s): $35