The number of $2, $20 and $100 notes in a piggy bank is in the ratio of 5 : 5 : 2. The notes are worth $2790 altogether. Find the total number of $20 and $100 notes.
|
$2 |
$20 |
$100 |
Total |
Number |
5 u |
5 u |
2 u |
|
Value |
$2 |
$20 |
$100 |
|
Total value |
10 u |
100 u |
200 u |
$2790 |
Total value of $2, $20 and $100 notes
= 10 u + 100 u + 200 u
= 310 u
310 u = 2790
1 u = 2790 ÷ 310 = 9
Number of $20 and $100 notes
= 5 u + 2 u
= 7 u
= 7 x 9
= 63
Answer(s): 63