The number of $5, $10 and $20 notes in a piggy bank is in the ratio of 6 : 2 : 3. The notes are worth $1100 altogether. Find the total number of $5 and $10 notes.
| |
$5 |
$10 |
$20 |
Total |
| Number |
6 u |
2 u |
3 u |
|
| Value |
$5 |
$10 |
$20 |
|
| Total value |
30 u |
20 u |
60 u |
$1100 |
Total value of $5, $10 and $20 notes
= 30 u + 20 u + 60 u
= 110 u
110 u = 1100
1 u = 1100 ÷ 110 = 10
Number of $5 and $10 notes
= 6 u + 2 u
= 8 u
= 8 x 10
= 80
Answer(s): 80
