# Barrel 3

Barrel with water has a weight 118 kg. When we get off 75% of water it has a weight 35 kg. How many kg has empty barrel?

Correct result:

x =  7.33 kg

#### Solution:

x+y=118
x+(1-75/100)y=35

x+y=118
x+(1-75/100)•y=35

x+y = 118
100x+25y = 3500

x = 22/3 ≈ 7.333333
y = 332/3 ≈ 110.666667

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