Question

В классе 20 учеников. Все сидят за партами по двое . Ровно треть мальчиков сидят с девочками, ровно половина девочек сидят с мальчиками. Сколько мальчиков в классе ? Ответы : А:9. Б:12. В:15. Г:16. Д:126

Answer 1

Problem Analysis

We are given that there are 20 students in a class, and they are sitting in pairs at desks. One-third of the boys are sitting with girls, and half of the girls are sitting with boys. We need to determine the number of boys in the class.

Solution

Let's assume the number of boys in the class is B and the number of girls is G. We know that there are 20 students in total, so we can write the equation:

B + G = 20 (Equation 1)

We are also given that one-third of the boys are sitting with girls, so the number of boys sitting with girls is **B/