The number of $5, $20 and $100 notes in a piggy bank is in the ratio of 6 : 9 : 4. The notes are worth $3050 altogether. Find the total number of $20 and $100 notes.
| |
$5 |
$20 |
$100 |
Total |
| Number |
6 u |
9 u |
4 u |
|
| Value |
$5 |
$20 |
$100 |
|
| Total value |
30 u |
180 u |
400 u |
$3050 |
Total value of $5, $20 and $100 notes
= 30 u + 180 u + 400 u
= 610 u
610 u = 3050
1 u = 3050 ÷ 610 = 5
Number of $20 and $100 notes
= 9 u + 4 u
= 13 u
= 13 x 5
= 65
Answer(s): 65
