The number of $2, $5 and $50 notes in a piggy bank is in the ratio of 5 : 9 : 7. The notes are worth $3645 altogether. Find the total number of $2 and $5 notes.
|
$2 |
$5 |
$50 |
Total |
Number |
5 u |
9 u |
7 u |
|
Value |
$2 |
$5 |
$50 |
|
Total value |
10 u |
45 u |
350 u |
$3645 |
Total value of $2, $5 and $50 notes
= 10 u + 45 u + 350 u
= 405 u
405 u = 3645
1 u = 3645 ÷ 405 = 9
Number of $2 and $5 notes
= 5 u + 9 u
= 14 u
= 14 x 9
= 126
Answer(s): 126