SOLUTION: There are boys and girls in a class. If the number of girls is multiplied by two and added to the number of boys in the class, the sum is 30. If the number of girls is multiplied b

Question 561125: There are boys and girls in a class. If the number of girls is multiplied by two and added to the number of boys in the class, the sum is 30. If the number of girls is multiplied by two and the number of boys in the class is subtracted from it, the result is 6. How many boys are in the class?
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
boys --------x
girls-------------y
2y+x=30
2y-x=6
add the two equations
4y=36
/4
y=9----------girls
plug x in first equation
2y+x=30
18+x=30
x=30-18
x=12--- boys

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