I had to rewrite the questions cause I don't know how to edit them on a computer and PLEASE ANSWER but here is the question:
1 answer:
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A good way of doing this problem would be to use cross multiplication of ratios
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Then cross multiply
(10 girls)(270 students)=(X girls)(18 students)
2700=18x
150=x
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Then cross multiply
(10 girls)(270 students)=(X girls)(18 students)
2700=18x
150=x
First we have to find length of 1 side of the square. We can use formula for area of the square. A=a*a ==> 
where a is length of the side.
From this formula we can find
a=
Now we just have to multiply it by 4, because there are 4 sides.
81*4=324 - its the answer
From this formula we can find
a=
Now we just have to multiply it by 4, because there are 4 sides.
81*4=324 - its the answer