The number of $5, $10 and $20 notes in a piggy bank is in the ratio of 5 : 4 : 1. The notes are worth $595 altogether. Find the total number of $10 and $20 notes.
|
$5 |
$10 |
$20 |
Total |
Number |
5 u |
4 u |
1 u |
|
Value |
$5 |
$10 |
$20 |
|
Total value |
25 u |
40 u |
20 u |
$595 |
Total value of $5, $10 and $20 notes
= 25 u + 40 u + 20 u
= 85 u
85 u = 595
1 u = 595 ÷ 85 = 7
Number of $10 and $20 notes
= 4 u + 1 u
= 5 u
= 5 x 7
= 35
Answer(s): 35