Copper parts

From copper cast were made 3 parts. At first consumed one third of casting, the second 2/3 of rest and the third weighed 18 kg. What is the weight of original copper cast?

Correct result:

x =  81 kg

Solution:

x/3+2/3•(x-x/3)+18=x

0.666667x = 54

x = 81

Our simple equation calculator calculates it.

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