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 answer:

x =  0.48 kg

Step-by-step explanation:


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

Pivot: Row 1 ↔ Row 2
100x+25y = 73
x+y = 1.48

Row 2 - 1/100 · Row 1 → Row 2
100x+25y = 73
0.75y = 0.75


y = 0.75/0.75 = 1
x = 73-25y/100 = 73-25 · 1/100 = 0.48

x = 12/25 = 0.48
y = 1

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