If you wanted to mix pure methane with water and end up with 70 gallons of 20% methane, how many gallons of each should you use? You should use gallons of water and gallons of methane > Next Question

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

Step-by-step explanation:

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step-by-step explanation:

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answer: 0

step-by-step explanation: the positive, like 5, + its opposite, like -5 would be 0

5+(-5)=0, or 5-5=0