The number of $5, $10 and $100 notes in a piggy bank is in the ratio of 7 : 3 : 3. The notes are worth $4380 altogether. Find the total number of $5 and $10 notes.
| |
$5 |
$10 |
$100 |
Total |
| Number |
7 u |
3 u |
3 u |
|
| Value |
$5 |
$10 |
$100 |
|
| Total value |
35 u |
30 u |
300 u |
$4380 |
Total value of $5, $10 and $100 notes
= 35 u + 30 u + 300 u
= 365 u
365 u = 4380
1 u = 4380 ÷ 365 = 12
Number of $5 and $10 notes
= 7 u + 3 u
= 10 u
= 10 x 12
= 120
Answer(s): 120
