The number of $2, $5 and $20 notes in a piggy bank is in the ratio of 8 : 6 : 3. The notes are worth $742 altogether. Find the total number of $5 and $20 notes.
| |
$2 |
$5 |
$20 |
Total |
| Number |
8 u |
6 u |
3 u |
|
| Value |
$2 |
$5 |
$20 |
|
| Total value |
16 u |
30 u |
60 u |
$742 |
Total value of $2, $5 and $20 notes
= 16 u + 30 u + 60 u
= 106 u
106 u = 742
1 u = 742 ÷ 106 = 7
Number of $5 and $20 notes
= 6 u + 3 u
= 9 u
= 9 x 7
= 63
Answer(s): 63
