The number of $5, $20 and $100 notes in a piggy bank is in the ratio of 7 : 5 : 5. The notes are worth $6350 altogether. Find the total number of $20 and $100 notes.
| |
$5 |
$20 |
$100 |
Total |
| Number |
7 u |
5 u |
5 u |
|
| Value |
$5 |
$20 |
$100 |
|
| Total value |
35 u |
100 u |
500 u |
$6350 |
Total value of $5, $20 and $100 notes
= 35 u + 100 u + 500 u
= 635 u
635 u = 6350
1 u = 6350 ÷ 635 = 10
Number of $20 and $100 notes
= 5 u + 5 u
= 10 u
= 10 x 10
= 100
Answer(s): 100
