In an envelope, there were a total of 96 notes. 75% of them were $10-notes. The rest were $5-notes. Vaidev took out some $10-notes. As a result, the remaining $10-notes made up 20% of the notes left in the envelope. Find the total value of the $10-notes Vaidev took out from the envelope.
|
$10 |
$5 |
Total |
Before |
3x4 = 12 u |
1x4 = 4 u |
4x4 = 16 u |
Change |
- ? |
|
|
After |
1x1 = 1 u |
4x1 = 4 u |
5x1 = 5 u |
75% =
75100 =
34
20% =
20100 =
15
The number of $5-notes remains unchanged. Make the number of $5-notes the same. LCM of 1 and 4 is 4.
Total number of notes at first = 16 u
16 u = 96
1 u = 96 ÷ 16 = 6
Number of $10-notes that Vaidev took out from the envelope
= 12 u - 1 u
= 11 u
= 11 x 6
= 66
Total value of $10-notes taken out
= 66 x 10
= $660
Answer(s): $660