book Maths Puzzle Numerical Ability

solve the equation below for y in terms of x
4x+3y=15

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book Other Question

An outboard motor calls for a fuel mixture that has a gasoline-to-oil ratio of 50 to 1. How many pints of oil should be added to 6 gallons of gasoline? What is 8/-3 - -7/5? I think I know what it is but I am not sure.