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andrew11 [14]
3 years ago
14

5 năm trước tổng số tuổi của hai mẹ con là 55 tuổi. Hiện nay tuổi con bằng 4/9 lần tuổi mẹ. Tính số tuổi của mẹ và tuổi con hiện

nay?
Mathematics
1 answer:
soldi70 [24.7K]3 years ago
3 0

Answer:

12

Step-by-step explanation:

12

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Let us assign variables.
Let x = egg mcmuffins
Let y = hash brown

Randy had:
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Jack had
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Using systems of linear equation, we can get the value for x and y by elimination. Subtract the equations.
2x + y = 750
x + y = 450
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Get y
x + y = 450
300 + y = 450
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So there are 300 calories for McMuffins and 150 calories for hash brown.
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azamat

Check the picture below.

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