The number of $5, $10 and $20 notes in a piggy bank is in the ratio of 1 : 7 : 3. The notes are worth $1485 altogether. Find the total number of $10 and $20 notes.
|
$5 |
$10 |
$20 |
Total |
Number |
1 u |
7 u |
3 u |
|
Value |
$5 |
$10 |
$20 |
|
Total value |
5 u |
70 u |
60 u |
$1485 |
Total value of $5, $10 and $20 notes
= 5 u + 70 u + 60 u
= 135 u
135 u = 1485
1 u = 1485 ÷ 135 = 11
Number of $10 and $20 notes
= 7 u + 3 u
= 10 u
= 10 x 11
= 110
Answer(s): 110