A jar contained $2 and $10 notes with a total value of $300. 8 pieces of $10 were exchanged for $2 notes of similar value. In the end, the number of $2 notes was the same as the $10 notes. How many $10 notes were there at first?
|
$2 |
$10 |
Before |
1 u - 40 |
1 u + 8 |
Change |
+ 40 |
- 8 |
After |
1 u |
1 u |
Total value of $2 and $10 notes remains unchanged after the exchange of notes of similar value.
Total value of 8 pieces of $10-notes
= 8 x 10
= $80
Number of $2-notes that 8 pieces of $10-notes were exchanged for
= 80 ÷ 2
= 40
In the end |
$2 |
$10 |
Total |
Number |
1 u |
1 u |
2 u |
Value |
2 |
10 |
|
Total Value |
2 u |
10 u |
12 u |
Total value of $2 and $10 notes
= 2 u + 10 u
= 12 u
12 u = 300
1 u = 300 ÷ 12 = 25
Number of $10 notes at first
= 1 u + 8
= 25 + 8
= 33
Answer(s): 33