The number of $10, $20 and $50 notes in a piggy bank is in the ratio of 9 : 6 : 8. The notes are worth $7320 altogether. Find the total number of $10 and $20 notes.
|
$10 |
$20 |
$50 |
Total |
Number |
9 u |
6 u |
8 u |
|
Value |
$10 |
$20 |
$50 |
|
Total value |
90 u |
120 u |
400 u |
$7320 |
Total value of $10, $20 and $50 notes
= 90 u + 120 u + 400 u
= 610 u
610 u = 7320
1 u = 7320 ÷ 610 = 12
Number of $10 and $20 notes
= 9 u + 6 u
= 15 u
= 15 x 12
= 180
Answer(s): 180