To find the ratio of blue to red in Aria's purple mixture, divide the amount of blue by the amount of red: 7 tbsp. / 2 tbsp. = 3.5.
To find the ratio of blue to red in Cody's purple mixture, divide the amount of blue by the amount of red: 21 tbsp. / 6 tbsp. = 3.5.
Both ratios are equal to 3.5, so their ratios of purple mixture are equivalent.
Cody and Aria are painting a mural. They decide they want part of the mural to have a purple background. Aria uses 7 tbsp. of blue to 2 tbsp. of red to make her purple paint. Cody is planning to use more and uses 21 tbsp. of blue to 6 tbsp. of red. Are their ratios of purple mixture equivalent to one another's?
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