The number of $2, $10 and $100 notes in a piggy bank is in the ratio of 3 : 9 : 1. The notes are worth $1960 altogether. Find the total number of $10 and $100 notes.
| |
$2 |
$10 |
$100 |
Total |
| Number |
3 u |
9 u |
1 u |
|
| Value |
$2 |
$10 |
$100 |
|
| Total value |
6 u |
90 u |
100 u |
$1960 |
Total value of $2, $10 and $100 notes
= 6 u + 90 u + 100 u
= 196 u
196 u = 1960
1 u = 1960 ÷ 196 = 10
Number of $10 and $100 notes
= 9 u + 1 u
= 10 u
= 10 x 10
= 100
Answer(s): 100
