Respostas

2013-07-28T14:42:06-03:00
550 _____ 100%
55 ______ x

x = 10%

Se faltaram 10% então participaram 90% dos inscritos
2013-07-28T14:42:12-03:00
100% _______________ 550
x  _________________ 55

550x=5500
x=5500/550
x=10%

100-10=90% <=RESPOSTA