The number of $20, $50 and $100 notes in a piggy bank is in the ratio of 2 : 9 : 4. The notes are worth $6230 altogether. Find the total number of $20 and $50 notes.
| |
$20 |
$50 |
$100 |
Total |
| Number |
2 u |
9 u |
4 u |
|
| Value |
$20 |
$50 |
$100 |
|
| Total value |
40 u |
450 u |
400 u |
$6230 |
Total value of $20, $50 and $100 notes
= 40 u + 450 u + 400 u
= 890 u
890 u = 6230
1 u = 6230 ÷ 890 = 7
Number of $20 and $50 notes
= 2 u + 9 u
= 11 u
= 11 x 7
= 77
Answer(s): 77
