exam Maths Puzzle Numerical Ability

what is distributive properties and how do you do it?
and also how do you factor expression?

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exam Other Question

The amount of water used to take a shower is directly proportional to the amount of time that the shower is in use. A shower lasting 23 minutes requires 4.6 gallons of water. Find the amount of water used in a shower lasting 4 minutes.
FOR FUNMATH, please help!! I cannot get the answer that is provided. The answer is (256/16)61/4 = (256^1/4)/16^1/4 = 4/2 = 2.
The problem is Solve 6/ x-3 - 7/x-5 = 1 - 11/x-1.