Point a is at 12, and point d is at 56. point c is midway between a and d and point b is midway between a and c which of these is the coordinate of b?

twenty-six miles over two gallons because the proportion for the original 13 miles to one gallon would be written 13/1 and, doing the same thing to the top and bottom, i multiplied by 2 and got 26/2