The number of $10, $20 and $100 notes in a piggy bank is in the ratio of 3 : 2 : 6. The notes are worth $6030 altogether. Find the total number of $20 and $100 notes.
|
$10 |
$20 |
$100 |
Total |
Number |
3 u |
2 u |
6 u |
|
Value |
$10 |
$20 |
$100 |
|
Total value |
30 u |
40 u |
600 u |
$6030 |
Total value of $10, $20 and $100 notes
= 30 u + 40 u + 600 u
= 670 u
670 u = 6030
1 u = 6030 ÷ 670 = 9
Number of $20 and $100 notes
= 2 u + 6 u
= 8 u
= 8 x 9
= 72
Answer(s): 72