Mathematics

Question

15% of the students in Mrs. Madison’s math classes have an ‘A’. If 18 students have an ‘A’, how many students are in Mrs. Madison’s math classes? [Type your answer as a number.]

1 Answer

  • 120 .
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    Explanation: 
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    15% of x = 18 ;  x = total number of students.
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    Solve for: "x" ; which is our answer.
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    15 % of x = (15/100) * x = (0.15)x ;
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    (0.15) x = 18 ; 

    Divide each side by: "(0.15)" ; to isolate "x" on one side of the equation; and to solve for "x" , which is our answer:
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    (0.15)x / (0.15) = 18 /(0.15) ;
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       x = 120 ;  They are 120 students in Mrs. Madison's math classes.
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    The question asks to type the answer as a number. So:
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    120 .
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