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All we need to do is to find the persentage of gray paint and when we have the number we can easily multiply it by 1 gallon again.

So we have:

48/80 · 100 = 60%

Therefore, we know that 60% of the paint is gray paint.

Now we multiply 1 gallon by 60% which will gives us the answer of 0.60 gallons.

So for every one gallon of paint, there are 0.60 gallons of gray paint and the left is white paint.

probability for j is 1/4

while

a is 1/6