The number of $2, $5 and $10 notes in a piggy bank is in the ratio of 9 : 2 : 4. The notes are worth $408 altogether. Find the total number of $2 and $5 notes.
|
$2 |
$5 |
$10 |
Total |
Number |
9 u |
2 u |
4 u |
|
Value |
$2 |
$5 |
$10 |
|
Total value |
18 u |
10 u |
40 u |
$408 |
Total value of $2, $5 and $10 notes
= 18 u + 10 u + 40 u
= 68 u
68 u = 408
1 u = 408 ÷ 68 = 6
Number of $2 and $5 notes
= 9 u + 2 u
= 11 u
= 11 x 6
= 66
Answer(s): 66