The number of $2, $10 and $100 notes in a piggy bank is in the ratio of 6 : 7 : 9. The notes are worth $11784 altogether. Find the total number of $2 and $10 notes.
| |
$2 |
$10 |
$100 |
Total |
| Number |
6 u |
7 u |
9 u |
|
| Value |
$2 |
$10 |
$100 |
|
| Total value |
12 u |
70 u |
900 u |
$11784 |
Total value of $2, $10 and $100 notes
= 12 u + 70 u + 900 u
= 982 u
982 u = 11784
1 u = 11784 ÷ 982 = 12
Number of $2 and $10 notes
= 6 u + 7 u
= 13 u
= 13 x 12
= 156
Answer(s): 156
