The number of $10, $20 and $50 notes in a piggy bank is in the ratio of 8 : 6 : 9. The notes are worth $3250 altogether. Find the total number of $10 and $20 notes.
| |
$10 |
$20 |
$50 |
Total |
| Number |
8 u |
6 u |
9 u |
|
| Value |
$10 |
$20 |
$50 |
|
| Total value |
80 u |
120 u |
450 u |
$3250 |
Total value of $10, $20 and $50 notes
= 80 u + 120 u + 450 u
= 650 u
650 u = 3250
1 u = 3250 ÷ 650 = 5
Number of $10 and $20 notes
= 8 u + 6 u
= 14 u
= 14 x 5
= 70
Answer(s): 70
