There are 500 students in a class. There are 165 girls in the class. There are 120 boys that have a back pack. Eighteen percent of all the students with back packs have water bottle. If 40% of all the students with both back packs and water bottle are girls, how many boys have both back packs and water bottle?
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because 500 of 40%is 20 then 120 boys and 165 girls and 20 are boys then 7 are girls
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