Na casa de Isabel, a leitura do hidrômetro, feita no dia 20 de março, indicava 2431 metros cúbicos. Uma nova leitura, feita um m
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Okay, here we have this:
Considering the provided information, we are going to identify wich equation applies, so we obtain the following:
Where x represents the uknown number. Then finally we obtain that the correct equation is the third one.
Now, let's find the missing number solving the equation:
Finally we obtain that the number is equal to 19.
