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Posted by on Sunday, November 18, 2012 at 2:20am.

55% of the studnts in a school are girls.find the total no. of studnt in the school if the no. of boys is 18 .

  • Math - , Sunday, November 18, 2012 at 2:46am

    S = Numbers of students

    Percent of boys.

    100 % - 55 % = 45 % = 45 / 100

    45 % S = 18

    45 S / 100 = 18 Multiply both sides by 100

    45 S = 18 * 100

    45 S = 1800 Divide both sides by 45

    S = 1800 / 45 = 40

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