A company is mixing a new juice blend in two mixing vats. In the smaller​ vat, workers mix 3 parts Juice​ A, 12 parts Juice​ B, and 15 parts Juice C. In the larger​ vat, workers mix 4 parts Juice​ A, 16 parts Juice​ B, and 20 parts Juice C. What is the ratio of the amount of Juice A to total amount of juice in simplest fraction form for the smaller​ vat? The larger​ vat? Are these ratios​ equivalent?