The number of $2, $50 and $100 notes in a piggy bank is in the ratio of 7 : 2 : 2. The notes are worth $3140 altogether. Find the total number of $2 and $50 notes.
| |
$2 |
$50 |
$100 |
Total |
| Number |
7 u |
2 u |
2 u |
|
| Value |
$2 |
$50 |
$100 |
|
| Total value |
14 u |
100 u |
200 u |
$3140 |
Total value of $2, $50 and $100 notes
= 14 u + 100 u + 200 u
= 314 u
314 u = 3140
1 u = 3140 ÷ 314 = 10
Number of $2 and $50 notes
= 7 u + 2 u
= 9 u
= 9 x 10
= 90
Answer(s): 90
