The number of $5, $10 and $20 notes in a piggy bank is in the ratio of 9 : 5 : 7. The notes are worth $1410 altogether. Find the total number of $5 and $10 notes.
|
$5 |
$10 |
$20 |
Total |
Number |
9 u |
5 u |
7 u |
|
Value |
$5 |
$10 |
$20 |
|
Total value |
45 u |
50 u |
140 u |
$1410 |
Total value of $5, $10 and $20 notes
= 45 u + 50 u + 140 u
= 235 u
235 u = 1410
1 u = 1410 ÷ 235 = 6
Number of $5 and $10 notes
= 9 u + 5 u
= 14 u
= 14 x 6
= 84
Answer(s): 84