Respostas

2013-09-18T11:33:59-03:00
20 - 100%
16 - x%

20x = 1600
x = 1600/20
x = 80% (80% de questões acertadas)

Bons estudos!
1 5 1
2013-09-18T11:36:36-03:00
 \frac{16}{20} .   \frac{x}{100}

 20X=1600

20+16= 36
 1600/36= 44%