Book Maths Puzzle Algebra

Paul weight 250 pounds,three times mack's weight is twice Paul, how many pounds does Paul weight? how many pounds does mack weight?

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Book Other Question

Joan rowed her boat across Lake Placid and back in 3 hours. Her rate returning was 2 mph less than the rate going. The distance each way was 7 miles. Find her rate each way. Let p be any positive prime. Prove that there is a prime q such that q is not equal to p and q divides p + 2.