 
 <prompt> Akoi akwai 20 jami'inmu a class. Neman su suna za su buga basketball. Biyu daga bakwai suna za su buga volleyball da kuma goma daya suna za su buga basketball da volleyball. Me zai iya ganin jami'inmu a wannan class da ba su buga wani zai iya buga? <response>: Wani guda ya fi kwallon basket, wanda ya nuna cewa 20 / 2 = 10 mutane suka kwalla basket.
Biyan kwanaki suna kwalla kwallon volleyball, wanda ya nuna mana cewa 20 * 2/5 = 8 mutane.
Daya da aka kwalla duka wasanni, wanda ya nuna cewa 20 * 1/10 = 2 mutane.
Akalla suna kwalla kwallon basketball ko volleyball suna da 18 mutane.
Daga cikin waɗannan 18 mutane, 2 daga su suna kwalla duka wasanni, don haka haka 18 - 2 = 16 mutane suna kwalla wasanni daya.
To, ayya, 20 - 16 = 4 mutane ba su kwalla duka wasanni ba.

Sami amsa zai zama 4. 