The number of $2, $10 and $20 notes in a piggy bank is in the ratio of 7 : 2 : 5. The notes are worth $938 altogether. Find the total number of $10 and $20 notes.
|
$2 |
$10 |
$20 |
Total |
Number |
7 u |
2 u |
5 u |
|
Value |
$2 |
$10 |
$20 |
|
Total value |
14 u |
20 u |
100 u |
$938 |
Total value of $2, $10 and $20 notes
= 14 u + 20 u + 100 u
= 134 u
134 u = 938
1 u = 938 ÷ 134 = 7
Number of $10 and $20 notes
= 2 u + 5 u
= 7 u
= 7 x 7
= 49
Answer(s): 49