In a mathematics class, 20 children had forgotten their rulers and 17 had forgotten their pencils, "Go and borrow them from someone at once", said the teacher, 24 children left the room, then how many children had forgotten both?
A
11
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B
12
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C
13
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D
14
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Solution
The correct option is B13
Let A be the set of children that have forgetten their rulers.
Let B be the set of children that have forgetten their pencils.