The number of $10, $20 and $50 notes in a piggy bank is in the ratio of 5 : 8 : 1. The notes are worth $2340 altogether. Find the total number of $10 and $20 notes.
| |
$10 |
$20 |
$50 |
Total |
| Number |
5 u |
8 u |
1 u |
|
| Value |
$10 |
$20 |
$50 |
|
| Total value |
50 u |
160 u |
50 u |
$2340 |
Total value of $10, $20 and $50 notes
= 50 u + 160 u + 50 u
= 260 u
260 u = 2340
1 u = 2340 ÷ 260 = 9
Number of $10 and $20 notes
= 5 u + 8 u
= 13 u
= 13 x 9
= 117
Answer(s): 117
