The number of $20, $50 and $100 notes in a piggy bank is in the ratio of 3 : 5 : 2. The notes are worth $5610 altogether. Find the total number of $50 and $100 notes.
| |
$20 |
$50 |
$100 |
Total |
| Number |
3 u |
5 u |
2 u |
|
| Value |
$20 |
$50 |
$100 |
|
| Total value |
60 u |
250 u |
200 u |
$5610 |
Total value of $20, $50 and $100 notes
= 60 u + 250 u + 200 u
= 510 u
510 u = 5610
1 u = 5610 ÷ 510 = 11
Number of $50 and $100 notes
= 5 u + 2 u
= 7 u
= 7 x 11
= 77
Answer(s): 77
