The number of $10, $20 and $100 notes in a piggy bank is in the ratio of 5 : 9 : 8. The notes are worth $5150 altogether. Find the total number of $20 and $100 notes.
|
$10 |
$20 |
$100 |
Total |
Number |
5 u |
9 u |
8 u |
|
Value |
$10 |
$20 |
$100 |
|
Total value |
50 u |
180 u |
800 u |
$5150 |
Total value of $10, $20 and $100 notes
= 50 u + 180 u + 800 u
= 1030 u
1030 u = 5150
1 u = 5150 ÷ 1030 = 5
Number of $20 and $100 notes
= 9 u + 8 u
= 17 u
= 17 x 5
= 85
Answer(s): 85