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pumpkin1625
High School
Roast beef has 25g of protein and 11g of calcium per serving. A serving of mashed potatoes has 2g of calcium and 25g of calcium. How many servings of each are needed to supply exactly 25g of protein and 61g of calcium?
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claudettoterohil
Let R and M be the numbers of serving of roast beef and mashed potato.
25R + 2M = 29 =====> 1
11R + 25M = 61 =====> 2
From (1): 2R = 29 - 25M
or M = 29/2 - 25/2 R
Substitute this into (2):
11R + 25(29/2 - 25/2 M) = 61
11R + 362.5 - 312.5R = 61
301.5 = 301.5R
R = 1
Using R = 1, we can get
11(1) + 25M = 61
25M = 50
M = 2
Therefore, you will need ONE SERVING of Roast Beef and TWO SERVINGS of Mash Potatoes.
Hope that helps!!!! : )
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