V= x*(10-2x)(8-2x)
for greatest volume, differentiate v w.r.t x and equate to 0,
dv/dx= (10-2x)(8-2x) + x(-2)(8-2x)+ x(10-2x)(-2)=0
you get x from solving the quadratic equation. volume will be max at that x
The exact number is 121.966019, so if you round to the nearest whole number, the answer is 122.
8/12 and 4/6 and10/15 and20/30 and 40/60
Answer=2/3
720/1080=72/108=8/12=2/3
720/1080=2/3
