The number of $10, $20 and $100 notes in a piggy bank is in the ratio of 5 : 8 : 4. The notes are worth $4880 altogether. Find the total number of $10 and $20 notes.
|
$10 |
$20 |
$100 |
Total |
Number |
5 u |
8 u |
4 u |
|
Value |
$10 |
$20 |
$100 |
|
Total value |
50 u |
160 u |
400 u |
$4880 |
Total value of $10, $20 and $100 notes
= 50 u + 160 u + 400 u
= 610 u
610 u = 4880
1 u = 4880 ÷ 610 = 8
Number of $10 and $20 notes
= 5 u + 8 u
= 13 u
= 13 x 8
= 104
Answer(s): 104