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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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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

[tex]b-boys\\g-girls\\\\ \left\{\begin{array}{ccc}b+g=51\\2g=b+12\end{array}
ight\\\\+\left\{\begin{array}{ccc}b+g=51\\2g-b=12\end{array}
ight\\----------\\.
\ \ \ \ \ \ 3g=63\ \ \ \ /:3\\.
\ \ \ \ \ \ g=21\\\\\ girls.
[/tex]

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Virtual Teaching Assistant: John B.
Question Level: Basic
Karma: Free
Upload Date: 5/31/2017

This 27 words question was answered by John B. on StudySoup on 5/31/2017. The question contains content related to Math Since its upload, it has received 144 views.

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