Barrel of oil

Barrel of oil weighs 238 kg. When it mold 20% oil, weighed 196 kg. What is the mass of the empty barrel?

Result

m =  28 kg

Solution:


m + o = 238
m + (1-20/100)*o = 196

m+o = 238
100m+80o = 19600

m = 28
o = 210

Calculated by our linear equations calculator.







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