The number of $10, $50 and $100 notes in a piggy bank is in the ratio of 7 : 8 : 2. The notes are worth $4020 altogether. Find the total number of $50 and $100 notes.
| |
$10 |
$50 |
$100 |
Total |
| Number |
7 u |
8 u |
2 u |
|
| Value |
$10 |
$50 |
$100 |
|
| Total value |
70 u |
400 u |
200 u |
$4020 |
Total value of $10, $50 and $100 notes
= 70 u + 400 u + 200 u
= 670 u
670 u = 4020
1 u = 4020 ÷ 670 = 6
Number of $50 and $100 notes
= 8 u + 2 u
= 10 u
= 10 x 6
= 60
Answer(s): 60
