a. The admission fee at a small fair is $1.50 for children and $4.00 for adults. On a certain day, 2200 people enter the fair and $5050 is collected. How many children and how many adults attended? b. The sum of the digits of a two-digit number is 7. When the digits are reversed, the number is increased by 27. Find the number. c. The product of two numbers is 4, and the sum of their squares 17. What are these numbers?

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