The number of $5, $50 and $100 notes in a piggy bank is in the ratio of 3 : 3 : 5. The notes are worth $3990 altogether. Find the total number of $50 and $100 notes.
| |
$5 |
$50 |
$100 |
Total |
| Number |
3 u |
3 u |
5 u |
|
| Value |
$5 |
$50 |
$100 |
|
| Total value |
15 u |
150 u |
500 u |
$3990 |
Total value of $5, $50 and $100 notes
= 15 u + 150 u + 500 u
= 665 u
665 u = 3990
1 u = 3990 ÷ 665 = 6
Number of $50 and $100 notes
= 3 u + 5 u
= 8 u
= 8 x 6
= 48
Answer(s): 48
