Acompany 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

40 brand muffins and 80 blueberry muffins.