The number of $5, $20 and $50 notes in a piggy bank is in the ratio of 6 : 9 : 7. The notes are worth $4480 altogether. Find the total number of $5 and $20 notes.
| |
$5 |
$20 |
$50 |
Total |
| Number |
6 u |
9 u |
7 u |
|
| Value |
$5 |
$20 |
$50 |
|
| Total value |
30 u |
180 u |
350 u |
$4480 |
Total value of $5, $20 and $50 notes
= 30 u + 180 u + 350 u
= 560 u
560 u = 4480
1 u = 4480 ÷ 560 = 8
Number of $5 and $20 notes
= 6 u + 9 u
= 15 u
= 15 x 8
= 120
Answer(s): 120
