c) In a classroom, a half of the students play football and a third of them play basketball. If
there are 4 students left playing tennis, how many students are in the classroom?
d) If you add thirteen to two times a number, you obtain a result of 99. What is the number?
e) A city square has a rectangular shape of 720 m2. Given that the long is two times the width
more 4 metres. What are its measures?
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