book Maths Puzzle Numerical Ability

3x-2y=4x+5?

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book Other Question

Two trains start form the same place at the same time heading in directly opposite directions. One train averages 65 mph, and the other train averages 75 mph. After how long will Simplify the following expression as much as possible:

t^2 square root of 8tx^2 minus x square root of 18t^5