The number of $2, $20 and $100 notes in a piggy bank is in the ratio of 5 : 9 : 7. The notes are worth $7120 altogether. Find the total number of $2 and $20 notes.
| |
$2 |
$20 |
$100 |
Total |
| Number |
5 u |
9 u |
7 u |
|
| Value |
$2 |
$20 |
$100 |
|
| Total value |
10 u |
180 u |
700 u |
$7120 |
Total value of $2, $20 and $100 notes
= 10 u + 180 u + 700 u
= 890 u
890 u = 7120
1 u = 7120 ÷ 890 = 8
Number of $2 and $20 notes
= 5 u + 9 u
= 14 u
= 14 x 8
= 112
Answer(s): 112
