Answer:
The original price of the books were <em>$9.</em>
Step-by-step explanation:
%100 - %30 = %70
%70 = 0.7
$6.30 ÷ 0.7 = $9
m=1.5
simultaneously
3m+9n=6
- m+9n=3
2m=3
For each , , so that
Meanwhile,
Each of the have PDF
for . From this we get
9 less than 3 times a number is 6
X = 45
Hope it will be helpful for you.