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 result:

f =  280 g


f + v = 1320
f + v - 3/10•v = 1008

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

f = 280
v = 1040

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