Powdered milk

A can of powdered milk and a can of evaporated milk cost $83.90 together. Two cans of evaporated milk and a can of powdered milk cost $118.05. How much is one can of powdered milk? How much is one can of evaporated milk?

Correct answer:

e =  34.15
p =  49.75

Step-by-step explanation:


p+e=83.90
2e+p=118.05

p+e=83.90
2·e+p=118.05

e+p = 83.9
2e+p = 118.05

Pivot: Row 1 ↔ Row 2
2e+p = 118.05
e+p = 83.9

Row 2 - 1/2 · Row 1 → Row 2
2e+p = 118.05
0.5p = 24.88


p = 24.875/0.5 = 49.75
e = 118.05-p/2 = 118.05-49.75/2 = 34.15

e = 683/20 = 34.15
p = 199/4 = 49.75

Our linear equations calculator calculates it.



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