exam Maths Puzzle Numerical Ability

Factor: 15+3y-5x^2-x^2y

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exam Other Question

-3(10x - 3) + 10(3x - 3) = x - 7 two trains traveled in opposite directions from the same starting point. one train traveled 25 mph faster than the other one. after 4 hours they were 456 miles apart. find the rate of each train.