exam Maths Puzzle Numerical Ability

an outboard motor calls for a fuel mixture of gasoline and oil to be 50 to 1. That is, 50 parts of gasoline to 1 part of oil. How many pints of oil should be added to 6 gallons of gasoline?

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Find the quotient and remainder of f(x)= x^3-4x^2+5x+5 divided by p(x) = x-1. My answer is x^2+2x+2; 7 but unsure if it is right. thanks for looking over my answer. not sure if in right category
but when the question is like jill does this in 30 min
bob does it in 45
sue takes an hour and a half
how long does it take all of them to do it together
i have no idea how to solve this problem