The number of $5, $10 and $20 notes in a piggy bank is in the ratio of 3 : 8 : 8. The notes are worth $2805 altogether. Find the total number of $10 and $20 notes.
| |
$5 |
$10 |
$20 |
Total |
| Number |
3 u |
8 u |
8 u |
|
| Value |
$5 |
$10 |
$20 |
|
| Total value |
15 u |
80 u |
160 u |
$2805 |
Total value of $5, $10 and $20 notes
= 15 u + 80 u + 160 u
= 255 u
255 u = 2805
1 u = 2805 ÷ 255 = 11
Number of $10 and $20 notes
= 8 u + 8 u
= 16 u
= 16 x 11
= 176
Answer(s): 176
