Question 1013399
v, the volume capacity of the tank.


{{{(v/2+8)/v=7/8}}} for comparing the volume of fuel in the tank to the tank's capacity volume.  Once this makes sense to you, just the arithmetic is still to be done.


{{{v/2+8=(7/8)v}}}

{{{(7/8)v-v/2=8}}}

{{{(7/8-1/2)v=8}}}

{{{(3/8)v=8}}}

{{{v=64/3}}}

{{{highlight(v=21&1/3)}}}