66%
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12 is what percent of 18= 12 / 18= 0.666667Converting decimal to a percentage:0.666667 * 100 = 66.67%
percentage of correct = 66.67%= (18-4)/18 * 100% = 12/18 * 100% = 0.6667 * 100% = 66.67%
percentage of 18 = 1800% 18 * 100% = 1800%
18/20 as a percentage is 90%
Total students = Girls (12) plus Boys (18) equal 30 ie Girls (12) divided by total Students (30) = .40 multiply by 100 to get percentages =40 %