Reservoir + water

Reservoir completely filled with water weighs 12 kg. After pouring off three quarters of the amount of water weights 3 kg. Calculate the weight and volume of the reservoir.

Correct result:

m =  0 kg
V =  12 l

Solution:

ρ=1 kg/l mH2O=VH2O

m+V = 12
12-3/4•V = 3

V+m = 12
3V = 36

V = 12
m = 0

Our linear equations calculator calculates it.



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