If you wanted to mix pure methane with water and end up with 140 gallons of 40% methane, how many gallons of each should you use?

Question

How many gallons of water and methane should be used

Answer 1

Water and methane do not mix.

Answer 2

You want 40% of 140 gallons to be methane,

so 60% of 140 gallons is water

 

methane:  0.4(140) = 56 gallons

water:  0.6(140)  = 84 gallons