Represent 68124

Girls are 12 more than boys, and boys represent 30% of all students. Find how many girls are in the class.

Correct answer:

d =  21

Step-by-step explanation:

q=30%=10030=103=0.3  d=12+a a=q (a+d) d=12+a a=0.3 (a+d)  ad=12 0.7a0.3d=0  Row20.7 Row1Row2 ad=12 0.4d=8.4  d=0.48.4=21 a=12+d=12+21=9  a=9 d=21

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