The number of $20, $50 and $100 notes in a piggy bank is in the ratio of 9 : 2 : 1. The notes are worth $2660 altogether. Find the total number of $50 and $100 notes.
|
$20 |
$50 |
$100 |
Total |
Number |
9 u |
2 u |
1 u |
|
Value |
$20 |
$50 |
$100 |
|
Total value |
180 u |
100 u |
100 u |
$2660 |
Total value of $20, $50 and $100 notes
= 180 u + 100 u + 100 u
= 380 u
380 u = 2660
1 u = 2660 ÷ 380 = 7
Number of $50 and $100 notes
= 2 u + 1 u
= 3 u
= 3 x 7
= 21
Answer(s): 21