Barrel 4

Barrel of water weighs 63 kg. After off 75% water, the weight of the barrel with water is 21 kg. How many kg weigh empty barrel and how many kgs water in it?

Correct answer:

x =  7 kg
y =  56 kg

Step-by-step explanation:


x+y=63
x+(1-75/100)y=21

x+y=63
x+(1-75/100)·y=21

x+y = 63
100x+25y = 2100

Pivot: Row 1 ↔ Row 2
100x+25y = 2100
x+y = 63

Row 2 - 1/100 · Row 1 → Row 2
100x+25y = 2100
0.75y = 42


y = 42/0.75 = 56
x = 2100-25y/100 = 2100-25 · 56/100 = 7

x = 7
y = 56

Our linear equations calculator calculates it.



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