The number of $2, $5 and $20 notes in a piggy bank is in the ratio of 2 : 3 : 4. The notes are worth $990 altogether. Find the total number of $5 and $20 notes.
|
$2 |
$5 |
$20 |
Total |
Number |
2 u |
3 u |
4 u |
|
Value |
$2 |
$5 |
$20 |
|
Total value |
4 u |
15 u |
80 u |
$990 |
Total value of $2, $5 and $20 notes
= 4 u + 15 u + 80 u
= 99 u
99 u = 990
1 u = 990 ÷ 99 = 10
Number of $5 and $20 notes
= 3 u + 4 u
= 7 u
= 7 x 10
= 70
Answer(s): 70