Children 82437

If 3 boys were added to the eighth grade, 50% of the class would be boys. If, on the other hand, 3 girls were added, they would make up 7/12 classes. How many children are there in the class?

Correct answer:

n =  33

Step-by-step explanation:

a+3=0.50 (a+3+b) b+3=127 (a+b+3)  a+3=0.50 (a+3+b) b+3=7/12 (a+b+3)  0.5a0.5b=1.5 7a5b=15  Pivot:Row1Row2 7a5b=15 0.5a0.5b=1.5  Row270.5 Row1Row2 7a5b=15 0.14b=2.57  b=0.142857142.57142857=18 a=715+5b=715+5 18=15  a=15 b=18  n=a+b=15+18=33



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