одно из чисел на 7 больше другого если меньшее число увеличить в 2 раза а большее на 6 то их сумма станет равной 31 найдите числа

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1. A SLEEPLESS NIGHT

One night I was alone at home with my ten-year-old daughter. She woke me up in the

middle of the night: "Mum, mum! There is a man outside the house. He is watching me

through the window!"

I looked out of the window. I could see the shape of a man outside. Who was he? What

was he doing there?

"I must get to the telephone in the hall and telephone the police," I thought.

I went downstairs hardly daring to breathe, afraid that he would hear my movements. I

reached for the telephone, lifted the receiver and dialled 999. The police answered and I

explained what had happened. They said that they would come at once.

Soon a police car stopped in front of the house. I hurried downstairs and opened the

front door. A police officer came in.

"What has happened?" he asked.

After listening to my story he went out, and after a while returned.

"It's all right," he said. "I have just seen that man. He is walking his dog. By the way, he

lives in the house opposite.

Найдите значение выражения 2,6+(-5,3+3,8)-(-2,8-0,8)

в 100г воды растворили 56 л хлористоводорода. найти концентрацию соляной кислоты в растворе