titik per 20 =titik per 25 = 6 per 30

[tex] \frac{...}{20} = \frac{...}{25} = \frac{6}{30} [/tex]

Sebelumnya
[tex] \frac{6}{30} = \frac{1}{5} [/tex]

Jadi,
[tex] \frac{1}{5} \times \frac{4}{4} = \frac{4}{20} [/tex]
dan
[tex] \frac{1}{5} \times \frac{5}{5} = \frac{5}{25} [/tex]

Jawabannya
[tex] \frac{4}{20} = \frac{5}{25} = \frac{6}{30} [/tex]