6 Why because my brain is huge
First, you have to divide 270 by 3, so you get 25%. This comes out to be 90. So, 90 is 25%. Now, multiply this by four to get 100%. This comes out to be 360. So, 270 is 75% of 360, which answers the question '270 is 75% of what number?'
17 11 9 and 7
Remember that the third side must be greater than 5 and less than 19.
The subtotal would be $11.25