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Math Help - arithmetic problem

  1. #1
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    arithmetic problem

    In a classroom which has 20 students,16 of the students are boys,24 are ten year old and 6 are girls who are not ten years old. How many students in the class are ten-year old boys?

    A 8 B 10 C 12 D 15 E 16
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  2. #2
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    Quote Originally Posted by sri340 View Post
    In a classroom which has 20 students,16 of the students are boys,24 are ten year old and 6 are girls who are not ten years old. How many students in the class are ten-year old boys?

    A 8 B 10 C 12 D 15 E 16

    We can't have 24 10-year-olds in a class of 20,
    nor can we have 6 girls if 16 are boys.

    Can you double-check the question ?

    Presumably there are 30 students in the class.

    Then, if you arrange the situation as sets,
    with x being the number of 10-year-old boys

    30=16-x+x+24-x+6
    30=46-x

    Hence, all the boys would be 10 years old
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