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1.There are 30 children in a school class.17 of them like the colour yellow. 13 of them like the colour red. 8 of them like both yellow and red. How many like neither yellow or red?
0
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8
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4
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9
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2.There are 30 children in a school class. 22 of them like yellow or red. 15 of them like yellow. 15 of them like red. How many like both red and yellow?
8
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7
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15
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22
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3.There are 100 wizards in Slytherin. 38 of them play quidditch, 49 speak parseltongue and 15 of them are in second year. 6 second years play quidditch, as do 8 parselmouths. Also, 2 second years are parselmouths. How many don't play quidditch, are not in second year and can't speak to snakes?