The number of $5, $20 and $100 notes in a piggy bank is in the ratio of 5 : 4 : 5. The notes are worth $3025 altogether. Find the total number of $20 and $100 notes.
| |
$5 |
$20 |
$100 |
Total |
| Number |
5 u |
4 u |
5 u |
|
| Value |
$5 |
$20 |
$100 |
|
| Total value |
25 u |
80 u |
500 u |
$3025 |
Total value of $5, $20 and $100 notes
= 25 u + 80 u + 500 u
= 605 u
605 u = 3025
1 u = 3025 ÷ 605 = 5
Number of $20 and $100 notes
= 4 u + 5 u
= 9 u
= 9 x 5
= 45
Answer(s): 45
