Предмет: Математика, автор: asya00741

решите олимпиадную задачу

Приложения:

Ответы

Автор ответа: масикакасика

Обозначим: В - всего детей в классе; Р - решившие задачу; Д и М - девочки и мальчики, соответственно; Мр и Мн - мальчики решившие и не решившие задачу, соответственно; Др и Дн - девочки решившие и не решившие задачу, соответственно.

В = М + Д = Мр + Мн + Др + Дн. Р = Мр + Др; Д = Др + Дн. По условию, Мр = Дн = х, значит Р = х + Др и Д = Др + х, т.е. Р = Д.

Ответ: количество решивших равно количеству девочек.

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Английский язык, автор: Natavoy

Choose the correct variant.
1. I have not seen my business partner since he ... London. a) has left b) had left c) left
2. I decided to go to my office immediately when I remembered I I ... the door. a) didn't lock b) hadn't locked c) haven't locked
3. He has made four presentations since he..... in Ukraine. a) has arrived b) arrived c) had arrived
4. I will be explaining this rule to you until I ... you understand it. a) will see b) shall see c) see
5. You will miss your train unless you... now. a) leave b) will leave c) do not leave
6. The plane which ... from Heathrow at 12.30 is expected to land in 5 minutes. a) took off b) had taken off c) was taking off
7. He ... his annual report at the moment. a) is preparing b) prepares c) has been
8. It will not be good if you wait till he ... about it from your boss. a) will learn b) learns c) will have learnt
9. Just as I thought, he ... our office easily. a) has found b) had found c) found
10. I knew he.... me before so I wondered why he didn't recognize me. a) had met b)met c) has met

6 лет назад

Предмет: Математика, автор: Kamillah8you

туристы прошли 21 км это 3/7 всего пути Сколько всего километров должны пройти туристы

6 лет назад

Предмет: Химия, автор: agalat935