The number of $2, $10 and $50 notes in a piggy bank is in the ratio of 7 : 3 : 8. The notes are worth $3108 altogether. Find the total number of $10 and $50 notes.
| |
$2 |
$10 |
$50 |
Total |
| Number |
7 u |
3 u |
8 u |
|
| Value |
$2 |
$10 |
$50 |
|
| Total value |
14 u |
30 u |
400 u |
$3108 |
Total value of $2, $10 and $50 notes
= 14 u + 30 u + 400 u
= 444 u
444 u = 3108
1 u = 3108 ÷ 444 = 7
Number of $10 and $50 notes
= 3 u + 8 u
= 11 u
= 11 x 7
= 77
Answer(s): 77
