The number of $5, $10 and $20 notes in a piggy bank is in the ratio of 5 : 4 : 3. The notes are worth $1250 altogether. Find the total number of $5 and $10 notes.
|
$5 |
$10 |
$20 |
Total |
Number |
5 u |
4 u |
3 u |
|
Value |
$5 |
$10 |
$20 |
|
Total value |
25 u |
40 u |
60 u |
$1250 |
Total value of $5, $10 and $20 notes
= 25 u + 40 u + 60 u
= 125 u
125 u = 1250
1 u = 1250 ÷ 125 = 10
Number of $5 and $10 notes
= 5 u + 4 u
= 9 u
= 9 x 10
= 90
Answer(s): 90