# The water barrel

The water barrel weighs 122 kg. If we pour 75% of the water out of it, it will weigh 35 kg. What is the weight of the barrel?

s =  6 kg

### Step-by-step explanation:

s+v=122
s + v -0.75 v = 35

s+v=122
s + v -0.75•v = 35

s+v = 122
s+0.25v = 35

s = 6
v = 116

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