book Maths Puzzle Numerical Ability

What are the divisibilty rules to the numbers 13,14,15,16,17,18,19 and 20?

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book Other Question

simplify the following algebraic expression

Multiply: (2s +5z)^2(s + 3z)^2 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.