In an envelope, there were a total of 70 notes. 70% of them were $10-notes. The rest were $50-notes. Bryan took out some $10-notes. As a result, the remaining $10-notes made up 25% of the notes left in the envelope. Find the total value of the $10-notes Bryan took out from the envelope.
| |
$10 |
$50 |
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 $50-notes remains unchanged. Make the number of $50-notes the same. LCM of 3 and 3 is 3.
Total number of notes at first = 10 u
10 u = 70
1 u = 70 ÷ 10 = 7
Number of $10-notes that Bryan took out from the envelope
= 7 u - 1 u
= 6 u
= 6 x 7
= 42
Total value of $10-notes taken out
= 42 x 10
= $420
Answer(s): $420
