The number of $2, $10 and $20 notes in a piggy bank is in the ratio of 5 : 9 : 2. The notes are worth $1260 altogether. Find the total number of $2 and $10 notes.
|
$2 |
$10 |
$20 |
Total |
Number |
5 u |
9 u |
2 u |
|
Value |
$2 |
$10 |
$20 |
|
Total value |
10 u |
90 u |
40 u |
$1260 |
Total value of $2, $10 and $20 notes
= 10 u + 90 u + 40 u
= 140 u
140 u = 1260
1 u = 1260 ÷ 140 = 9
Number of $2 and $10 notes
= 5 u + 9 u
= 14 u
= 14 x 9
= 126
Answer(s): 126