Răspuns:
a)
[tex] \frac{20}{100} \times y = 50[/tex]
20y/100 = 50
20y = 50 × 100 = 5 000
ay = 5 000/ 20 = 250
b)
[tex] \frac{35}{100} \times y = 4200[/tex]
35y/100 = 4 200
35y = 4 200 × 100 = 420 000
y = 420 000/35 = 12 000
c)
[tex] \frac{18}{100} \times y = 36[/tex]
18y/100 = 36
18y = 36 × 100 = 3 600
y = 3 600 / 18 = 200
d)
[tex] \frac{0.2}{100} \times y = 1[/tex]
0,2y/100 = 1
0,2 y = 1 × 100 = 100
y = 100 / 0,2 = 500
