Set up a proportion. 2/5 = x/40
to solve the equation first cross multiply.
x*5=40*2
x*5=80
now divide both sides by 5, 80 divided by 5 is equal to 16.
so the number of girls in the computer lab is 16.
Answer:the first one
Step-by-step explanation:Egd
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A option
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5
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The answer is 7 . First you would make the mixed fraction an improper fraction so , 3 1/2 would turn into 7/2. Them you would put 2 over 1 so you can multiply it to 7/2, so it would be 2/1 x 7/2 . So, 2 x 7 = 14 and 1 x 2 = 2 so it would be 14/2 , and to simplify you would divide 14 into 2 and it would be 7 because 7 x 2=14 . So, the answer is 7 .
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