book Maths Puzzle Numerical Ability

The difference of two numbers is 34. The second is 4 less than 3 times the first. What are the two numbers? The sum of two numbers is 92. The second is 4 more that 3 times the first what are the two numbers?

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book Other Question

(-3xy^-9)^-2/(xy^-7)^-2

Simplify the expression using positive exponents only. A math teacher is randomly distributing 15 rulers with centimeter laables and 10 rulers without centimeter labels. What is the probability that the first ruler she hands out will have centimeter labels and the second ruler will not have labels?