Farida opa pishirgan tortlarning: 1/3 qismi — ananasli; 1/4 qismi — qaymoqli; qolganlari shokoladli. Shokoladli tortlar ananasli tortlardan bittaga ko‘p bo‘lsa, Farida opa pishirgan tortlarning jami sonini toping.

Jami tortlar sonini x deb olamiz. Shokoladli tortlar ulushi: \(1-\frac{1}{3}-\frac{1}{4}=\frac{5}{12}\).

Shokoladli tortlar ananasli tortlardan bittaga ko‘p, demak:

\(\frac{5}{12}x-\frac{1}{3}x=1\)

\(\frac{1}{12}x=1\), shuning uchun \(x=12\).

Javob: Farida opa jami 12 ta tort pishirgan.