Question

un elev rezolva corect 80 % din tema care are 20 de exercitii.cate exercitii a rezolvat corect elevul,dau coroana.multumesc

Answer 1

80 % din 20 = $\frac{80}{100}$ x 20 = $\frac{80 x 20}{100}$ = 16 exercitii 

Answer 2

20 exerc . ......100%
x    ..............80 %
x =20*80/100 =16 exercitii