The number of $20, $50 and $100 notes in a piggy bank is in the ratio of 2 : 5 : 5. The notes are worth $5530 altogether. Find the total number of $50 and $100 notes.
| |
$20 |
$50 |
$100 |
Total |
| Number |
2 u |
5 u |
5 u |
|
| Value |
$20 |
$50 |
$100 |
|
| Total value |
40 u |
250 u |
500 u |
$5530 |
Total value of $20, $50 and $100 notes
= 40 u + 250 u + 500 u
= 790 u
790 u = 5530
1 u = 5530 ÷ 790 = 7
Number of $50 and $100 notes
= 5 u + 5 u
= 10 u
= 10 x 7
= 70
Answer(s): 70
