A bottle

A bottle full of cola weighs 1,320 g. If we drink three-tenths of it, it will weigh 1,008g. How much does an empty bottle weigh?

Correct answer:

f =  280 g

Step-by-step explanation:


f + v = 1320
f + v - 3/10·v = 1008

f+v = 1320
10f+7v = 10080

Pivot: Row 1 ↔ Row 2
10f+7v = 10080
f+v = 1320

Row 2 - 1/10 · Row 1 → Row 2
10f+7v = 10080
0.3v = 312


v = 312/0.3 = 1040
f = 10080-7v/10 = 10080-7 · 1040/10 = 280

f = 280
v = 1040

Our linear equations calculator calculates it.



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