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 result:

x =  7 kg
y =  56 kg

Solution:

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

x+y=63
x+(1-75/100)•y=21

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

x = 7
y = 56

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