The number of $5, $10 and $50 notes in a piggy bank is in the ratio of 9 : 1 : 7. The notes are worth $3645 altogether. Find the total number of $10 and $50 notes.
|
$5 |
$10 |
$50 |
Total |
Number |
9 u |
1 u |
7 u |
|
Value |
$5 |
$10 |
$50 |
|
Total value |
45 u |
10 u |
350 u |
$3645 |
Total value of $5, $10 and $50 notes
= 45 u + 10 u + 350 u
= 405 u
405 u = 3645
1 u = 3645 ÷ 405 = 9
Number of $10 and $50 notes
= 1 u + 7 u
= 8 u
= 8 x 9
= 72
Answer(s): 72