The number of $2, $10 and $20 notes in a piggy bank is in the ratio of 8 : 2 : 3. The notes are worth $1152 altogether. Find the total number of $2 and $10 notes.
|
$2 |
$10 |
$20 |
Total |
Number |
8 u |
2 u |
3 u |
|
Value |
$2 |
$10 |
$20 |
|
Total value |
16 u |
20 u |
60 u |
$1152 |
Total value of $2, $10 and $20 notes
= 16 u + 20 u + 60 u
= 96 u
96 u = 1152
1 u = 1152 ÷ 96 = 12
Number of $2 and $10 notes
= 8 u + 2 u
= 10 u
= 10 x 12
= 120
Answer(s): 120