The number of $5, $20 and $50 notes in a piggy bank is in the ratio of 6 : 7 : 8. The notes are worth $6270 altogether. Find the total number of $20 and $50 notes.
| |
$5 |
$20 |
$50 |
Total |
| Number |
6 u |
7 u |
8 u |
|
| Value |
$5 |
$20 |
$50 |
|
| Total value |
30 u |
140 u |
400 u |
$6270 |
Total value of $5, $20 and $50 notes
= 30 u + 140 u + 400 u
= 570 u
570 u = 6270
1 u = 6270 ÷ 570 = 11
Number of $20 and $50 notes
= 7 u + 8 u
= 15 u
= 15 x 11
= 165
Answer(s): 165
