The number of $2, $5 and $100 notes in a piggy bank is in the ratio of 9 : 9 : 2. The notes are worth $1578 altogether. Find the total number of $5 and $100 notes.
| |
$2 |
$5 |
$100 |
Total |
| Number |
9 u |
9 u |
2 u |
|
| Value |
$2 |
$5 |
$100 |
|
| Total value |
18 u |
45 u |
200 u |
$1578 |
Total value of $2, $5 and $100 notes
= 18 u + 45 u + 200 u
= 263 u
263 u = 1578
1 u = 1578 ÷ 263 = 6
Number of $5 and $100 notes
= 9 u + 2 u
= 11 u
= 11 x 6
= 66
Answer(s): 66
