book Maths Puzzle Numerical Ability

Beth ate at a steakhouse. The cost of the meal plus a 15% tip was $42.50. What was the cost of the meal before the tip was added?

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Hi, my name is virna and im really not sure where this question is catogorize under, but here's my question: What is the Additive inverse of a number and also, what is the absolute how would you find the slope of 8x+9y=86 and what is y-intersept,x-intersept what would be the new equation