The number of $2, $10 and $50 notes in a piggy bank is in the ratio of 5 : 7 : 3. The notes are worth $1840 altogether. Find the total number of $2 and $10 notes.
| |
$2 |
$10 |
$50 |
Total |
| Number |
5 u |
7 u |
3 u |
|
| Value |
$2 |
$10 |
$50 |
|
| Total value |
10 u |
70 u |
150 u |
$1840 |
Total value of $2, $10 and $50 notes
= 10 u + 70 u + 150 u
= 230 u
230 u = 1840
1 u = 1840 ÷ 230 = 8
Number of $2 and $10 notes
= 5 u + 7 u
= 12 u
= 12 x 8
= 96
Answer(s): 96
