The number of $2, $5 and $20 notes in a piggy bank is in the ratio of 4 : 3 : 7. The notes are worth $978 altogether. Find the total number of $5 and $20 notes.
| |
$2 |
$5 |
$20 |
Total |
| Number |
4 u |
3 u |
7 u |
|
| Value |
$2 |
$5 |
$20 |
|
| Total value |
8 u |
15 u |
140 u |
$978 |
Total value of $2, $5 and $20 notes
= 8 u + 15 u + 140 u
= 163 u
163 u = 978
1 u = 978 ÷ 163 = 6
Number of $5 and $20 notes
= 3 u + 7 u
= 10 u
= 10 x 6
= 60
Answer(s): 60
