The number of $2, $5 and $20 notes in a piggy bank is in the ratio of 3 : 9 : 4. The notes are worth $1179 altogether. Find the total number of $5 and $20 notes.
| |
$2 |
$5 |
$20 |
Total |
| Number |
3 u |
9 u |
4 u |
|
| Value |
$2 |
$5 |
$20 |
|
| Total value |
6 u |
45 u |
80 u |
$1179 |
Total value of $2, $5 and $20 notes
= 6 u + 45 u + 80 u
= 131 u
131 u = 1179
1 u = 1179 ÷ 131 = 9
Number of $5 and $20 notes
= 9 u + 4 u
= 13 u
= 13 x 9
= 117
Answer(s): 117
