Barrel with water

The water barrel weighs 52 kg. When we pour a quarter of the water, the barrel’s weight is reduced to 40 kg. Determine the weight of the empty barrel.

Correct answer:

m =  4 kg

Step-by-step explanation:

m+v=52 m+(vv/4)=40  m+v=52 4m+3v=160  Pivot:Row1Row2 4m+3v=160 m+v=52  Row241 Row1Row2 4m+3v=160 0.25v=12  v=0.2512=48 m=41603v=41603 48=4=4 kg  m=4 v=48



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