The number of $20, $50 and $100 notes in a piggy bank is in the ratio of 9 : 9 : 8. The notes are worth $15730 altogether. Find the total number of $20 and $50 notes.
| |
$20 |
$50 |
$100 |
Total |
| Number |
9 u |
9 u |
8 u |
|
| Value |
$20 |
$50 |
$100 |
|
| Total value |
180 u |
450 u |
800 u |
$15730 |
Total value of $20, $50 and $100 notes
= 180 u + 450 u + 800 u
= 1430 u
1430 u = 15730
1 u = 15730 ÷ 1430 = 11
Number of $20 and $50 notes
= 9 u + 9 u
= 18 u
= 18 x 11
= 198
Answer(s): 198
