Answer: C. 27/31 fluid ounce
Step-by-step explanation:
First, let's turn the mixed number into a fraction:
[tex]1\frac{1}{30}=\frac{(1*30)+1}{30} =\frac{31}{30}[/tex]
Then, to solve the problem we can use a simple rule of three:
31/30 ----------3/10
3 ----------- x
This can be read as: If to make 31/30 fluid ounces of purple you need 3/10 fluid ounces of red, then to make 3 fluid ounces of purple how many fluid ounces of red will you need?
[tex]x=\frac{3*\frac{3}{10} }{\frac{31}{30} } =\frac{\frac{9}{10} }{\frac{31}{30} }=\frac{9*30}{10*31}=\frac{270}{310}=\frac{27}{31}[/tex]
So, to make 3 fluid ounces of purple paint, Isabelle will need 27/31 fluid ounces of red paint.
