book Maths Puzzle Numerical Ability

Mark Sullivan has only $40. He wishes to leave a 15% tip and must pay 7% tax. Find the price of the most expensive meal that he can order.

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book Other Question

What are the divisibilty rules to the numbers 13,14,15,16,17,18,19 and 20? I am helping in after school tutoring and I want to be sure I am correct-

when you do an equation such as : 5z squared + 9z squared = 504
what do you do with the exponents?