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Erin reads an average of 20 books per year. She read 23, 17, 20, and 19 books in four different years. How many books did Erin read in the 5th year to make it an average of exactly 20.0 per year?
17 20 21 19
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A clown came to the party with 50 red balloons, 50 blue balloons, and 75 white balloons. Half of the blue balloons popped and 10 of the white balloons flew away. How many did the clown have left to give away to the kids?