Odpowiedź:
1.
85g ---> 100%
15g ----> x%
x = (15*100)/85 = 1500/85 = 17,6 %
2.
30g ---> 100%
x g -----> 6%
x = (30*6)/100 = 180/100 = 1,8 g
3.
200g ---> 100%
x g -------> 20%
x = (20*200)/100 = 4000/100 = 40 g
4.
80 + 240 = 320
320 g ---> 100%
80 g -----> x %
x = (80*100)/320 = 8000/320 = 25%
Wyjaśnienie: