The number of $2, $5 and $10 notes in a piggy bank is in the ratio of 2 : 8 : 7. The notes are worth $1140 altogether. Find the total number of $5 and $10 notes.
|
$2 |
$5 |
$10 |
Total |
Number |
2 u |
8 u |
7 u |
|
Value |
$2 |
$5 |
$10 |
|
Total value |
4 u |
40 u |
70 u |
$1140 |
Total value of $2, $5 and $10 notes
= 4 u + 40 u + 70 u
= 114 u
114 u = 1140
1 u = 1140 ÷ 114 = 10
Number of $5 and $10 notes
= 8 u + 7 u
= 15 u
= 15 x 10
= 150
Answer(s): 150