A company ordered $400 worth of muffins. Bran muffins cost $2 each and blueberry muffins cost $4 each. If the company ordered twice as many blueberry muffins as bran muffins, how many muffins were ordered total

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Variables:

number of bran muffins: x

number of blueberry muffins: y

Cost=> (1) 2x + 4y = 400

Ratio=> (2) y = 2x

Solution:

Equation (1) + Equation (2)

2x + 4y + y = 400 + 2x

=> 5y = 400 = > y = 400 / 5 = 80

From equation (2) y = 2x = > x = y/2 = 80/2 = 40

Answer: 40 brand muffins and 80 blueberry muffins.