The number of $2, $10 and $50 notes in a piggy bank is in the ratio of 7 : 2 : 4. The notes are worth $2340 altogether. Find the total number of $2 and $10 notes.
|
$2 |
$10 |
$50 |
Total |
Number |
7 u |
2 u |
4 u |
|
Value |
$2 |
$10 |
$50 |
|
Total value |
14 u |
20 u |
200 u |
$2340 |
Total value of $2, $10 and $50 notes
= 14 u + 20 u + 200 u
= 234 u
234 u = 2340
1 u = 2340 ÷ 234 = 10
Number of $2 and $10 notes
= 7 u + 2 u
= 9 u
= 9 x 10
= 90
Answer(s): 90