Em uma sala 20% dos alunos gostam de jogar vôlei e os 42 alunos restantes gostam de jogar futebol. Quantos alunos há nessa turma?
In a class, 20% of the students like to play volleyball and the remaining 42 students like to play soccer. How many students are there in this class?
Let S be the total number of students. Then
0.2S + 42 = S
0.8S = 42
S = 42/0.8 = 52.5
Wow, the class has half a student!
Are you sure you didn't mean 40 students like to play soccer?
Tem certeza que não quis dizer que 40 alunos gostam de jogar futebol?