The number of $5, $10 and $20 notes in a piggy bank is in the ratio of 1 : 7 : 7. The notes are worth $1720 altogether. Find the total number of $5 and $10 notes.
|
$5 |
$10 |
$20 |
Total |
Number |
1 u |
7 u |
7 u |
|
Value |
$5 |
$10 |
$20 |
|
Total value |
5 u |
70 u |
140 u |
$1720 |
Total value of $5, $10 and $20 notes
= 5 u + 70 u + 140 u
= 215 u
215 u = 1720
1 u = 1720 ÷ 215 = 8
Number of $5 and $10 notes
= 1 u + 7 u
= 8 u
= 8 x 8
= 64
Answer(s): 64