Water container

Container with water weighs 1.48 kg. When we cast 75% of water container of water weight 0.73 kg. How heavy is an empty container?

Correct result:

x =  0.48 kg

Solution:


x+y=1.48
x+(1-75/100)y=0.73

x+y=1.48
x+(1-75/100)•y=0.73

x+y = 1.48
100x+25y = 73

x = 12/25 = 0.48
y = 1

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