Copper parts

The metallurgic company made three parts from the copper cast. The first consumed one-third of the casting, the second 2/3 of the rest, and the third weighed 18 kg. What is the weight of the original copper cast?

Correct answer:

x =  81 kg

Step-by-step explanation:


x/3+2/3·(x-x/3)+18=x

0.666667x = 54


x = 54/0.66666667 = 81

x = 81

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