When is the math test?

Logic Level 2

Five girls are not in complete agreement about the date of the Math test.

  • Andrea says it will be in August, 16th, Monday;
  • Daniela says it will be in August, 16th, Tuesday;
  • Fernanda says it will be in September, 17th, Tuesday;
  • Patricia says it will be in August, 17th, Monday;
  • Tatiane says it will be in September, 17th, Monday.

Only one of them is completely right.
The others guessed at least one of these information correctly: the month, the day or the weekday.
Who is right?

Problem Source: OBMEP 2014

Image credit: Wikipedia Peter van der Sluijs
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