The number of $10, $20 and $50 notes in a piggy bank is in the ratio of 3 : 6 : 5. The notes are worth $2400 altogether. Find the total number of $20 and $50 notes.
|
$10 |
$20 |
$50 |
Total |
Number |
3 u |
6 u |
5 u |
|
Value |
$10 |
$20 |
$50 |
|
Total value |
30 u |
120 u |
250 u |
$2400 |
Total value of $10, $20 and $50 notes
= 30 u + 120 u + 250 u
= 400 u
400 u = 2400
1 u = 2400 ÷ 400 = 6
Number of $20 and $50 notes
= 6 u + 5 u
= 11 u
= 11 x 6
= 66
Answer(s): 66