I'm not quite sure when I figured it out I'll tell you
A rotation of 180 degrees clockwise is
(x,y) goes to (-x,-y) even for counterclockwise
That equals 30 because, 10x5= 50+5x3 which equals to 15 will be 65. - 14x2=28... 65-28=37-7=30.
5/8
10 ibs / 8 =1.25 ibs
1.25 ibs * 5 = 6.25 ibs.
He used 6.25 ibs and has 3.75 ibs of soil left for his garden.