Answer:
A and B are correct
Step-by-step explanation:
15 is 30% of
50 Change the percentage to a decimal by dividing it over 100:

Divide 15 over 0.3:
A
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12 more boys than girls
ratio of boys to girls = 7:5
thus 2/12 is difference between boys and girls = 12
total students = 12 ÷ 2/12 = 72