Question

Когда в школе объявили день вежливости,каждый мальчик из 5А класса поздоровался за руку с каждой девочкой из своего класса.Всего при этом было 77 рукопожатий.Сколько учеников а 5А

Answer 1

Ответ:77 учеников. . . . . .

Answer 2

I can help you with your math problem.

Let x be the number of boys and y be the number of girls in 5A class. Then, the total number of handshakes is x times y, or xy. We know that xy = 77, and x and y are positive integers. We can find the possible pairs of x and y by factoring 77. The factors of 77 are 1, 7, 11, and 77. So, the possible pairs are (1, 77), (7, 11), (11, 7), and (77, 1). However, we can eliminate the pairs (1, 77) and (77, 1) because they are unrealistic. There cannot be only one boy or one girl in the class. Therefore, the only realistic pairs are (7, 11) and (11, 7). This means that there are either 7 boys and 11 girls, or 11 boys and 7 girls in the class. The total number of students in either case is 18.

You can find more detailed explanations and examples of this type of problem on these websites: [Uchi.ru](https://uchi.ru/otvety/questions/kogda-v-shkole-obyavili-den-vezhlivosti-kazhdiy-malchik-iz-5a-klassa-pozdorovalsya-za-ruk), [Uchi.ru](https://uchi.ru/otvety/questions/kogda-v-shkole-obyavili-den-vezhlivosti-kazhdiy-malchik-iz-5a-klassa-pozdorovalsya-za-ruk-2c29af2f-05cd-4529-ba07-4d99a9756688), [Znanija.site](https://znanija.site/matematika/19606710.html). I hope this helps.