book Maths Puzzle Numerical Ability

Combine like terms.

5w + 5x - 9w

A) w + x B) 10w - 9x C) -4w + 5x D) wx

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book Other Question

Why must units of an expression be the same in order to be combined? 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