The number of $5, $10 and $50 notes in a piggy bank is in the ratio of 4 : 3 : 1. The notes are worth $500 altogether. Find the total number of $10 and $50 notes.
| |
$5 |
$10 |
$50 |
Total |
| Number |
4 u |
3 u |
1 u |
|
| Value |
$5 |
$10 |
$50 |
|
| Total value |
20 u |
30 u |
50 u |
$500 |
Total value of $5, $10 and $50 notes
= 20 u + 30 u + 50 u
= 100 u
100 u = 500
1 u = 500 ÷ 100 = 5
Number of $10 and $50 notes
= 3 u + 1 u
= 4 u
= 4 x 5
= 20
Answer(s): 20
