The number of $2, $5 and $10 notes in a piggy bank is in the ratio of 5 : 6 : 4. The notes are worth $720 altogether. Find the total number of $2 and $5 notes.
|
$2 |
$5 |
$10 |
Total |
Number |
5 u |
6 u |
4 u |
|
Value |
$2 |
$5 |
$10 |
|
Total value |
10 u |
30 u |
40 u |
$720 |
Total value of $2, $5 and $10 notes
= 10 u + 30 u + 40 u
= 80 u
80 u = 720
1 u = 720 ÷ 80 = 9
Number of $2 and $5 notes
= 5 u + 6 u
= 11 u
= 11 x 9
= 99
Answer(s): 99