The number of $5, $10 and $20 notes in a piggy bank is in the ratio of 9 : 2 : 4. The notes are worth $725 altogether. Find the total number of $5 and $10 notes.
|
$5 |
$10 |
$20 |
Total |
Number |
9 u |
2 u |
4 u |
|
Value |
$5 |
$10 |
$20 |
|
Total value |
45 u |
20 u |
80 u |
$725 |
Total value of $5, $10 and $20 notes
= 45 u + 20 u + 80 u
= 145 u
145 u = 725
1 u = 725 ÷ 145 = 5
Number of $5 and $10 notes
= 9 u + 2 u
= 11 u
= 11 x 5
= 55
Answer(s): 55