The number of $2, $10 and $20 notes in a piggy bank is in the ratio of 1 : 4 : 8. The notes are worth $2424 altogether. Find the total number of $10 and $20 notes.
|
$2 |
$10 |
$20 |
Total |
Number |
1 u |
4 u |
8 u |
|
Value |
$2 |
$10 |
$20 |
|
Total value |
2 u |
40 u |
160 u |
$2424 |
Total value of $2, $10 and $20 notes
= 2 u + 40 u + 160 u
= 202 u
202 u = 2424
1 u = 2424 ÷ 202 = 12
Number of $10 and $20 notes
= 4 u + 8 u
= 12 u
= 12 x 12
= 144
Answer(s): 144