SOLUTION: The number of boys in ninth grade is 12 less than twice the number of girls. There are 51 students in ninth grade. How many are girls?

Question 245041: The number of boys in ninth grade is 12 less than twice the number of girls. There are 51 students in ninth grade. How many are girls?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
The number of boys in ninth grade is 12 less than twice the number of girls. There are 51 students in ninth grade. How many are girls?
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Equations:
b + g = 51
b = 2g-12
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Substitute for "b" and solve for "g":
2g-12 + g = 51
3g = 63
g = 21 (# of girls)
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Cheers,
Stan H.
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