The number of $10, $50 and $100 notes in a piggy bank is in the ratio of 2 : 7 : 8. The notes are worth $12870 altogether. Find the total number of $10 and $50 notes.
|
$10 |
$50 |
$100 |
Total |
Number |
2 u |
7 u |
8 u |
|
Value |
$10 |
$50 |
$100 |
|
Total value |
20 u |
350 u |
800 u |
$12870 |
Total value of $10, $50 and $100 notes
= 20 u + 350 u + 800 u
= 1170 u
1170 u = 12870
1 u = 12870 ÷ 1170 = 11
Number of $10 and $50 notes
= 2 u + 7 u
= 9 u
= 9 x 11
= 99
Answer(s): 99