c per 20 = 5 per 25 = c =

[tex] \frac{c}{20} = \frac{5}{25} [/tex]

c = 5 x 20 / 25

c = 4


semoga membantu

c/20 = 5/25
c x 25 = 20 x 5
c x 25 = 100
c = 100/25
c = 4