Можно еще вот так решить:
3 кг - 120% т.к.100%+20%=120% (тоесть ,3 кг по наценке)
х кг - 100% (тоесть ,х кг тереть составят полную стопроцентную стоимость)
По правилу креста:
х=3*100/120=300/120=2,5 (кг)
ответ:на теже деньги можно купить 2,5 кг яблок по новой цене)
He said that he was living in London.
She wondered what I wanted.
She wanted to know why that machine didn’t work.
He asked me not to sell the car.
She wondered if I could open my bag.
He told me to stay in bed for a few days.
Marry said that she had gone to London with her sister.
My friend said that he(she) watched a lot of soap operas.
He asked me if Tom would be there the next day.
My mother wanted to know if I had cleaned the room the day before.
Her teacher said that she wasn’t going to ask me.
The teacher asked how the accident had happened.
My cousin said that they weren’t intrested in politics.
I asked you if you hadn’t heard the bell.
He wants to know what I had told the police.
Tom said that New York is/ was more lovely than London.
She said that he had turned out a good pianist.
She wondered if I was kidding.
She wrote to put up at that hotel.
I wanted to know where you were living then.
He said that he was living in London.
She wondered what I wanted.
She wanted to know why that machine didn’t work.
He asked me not to sell the car.
She wondered if I could open my bag.
He told me to stay in bed for a few days.
Marry said that she had gone to London with her sister.
My friend said that he(she) watched a lot of soap operas.
He asked me if Tom would be there the next day.
My mother wanted to know if I had cleaned the room the day before.
Her teacher said that she wasn’t going to ask me.
The teacher asked how the accident had happened.
My cousin said that they weren’t intrested in politics.
I asked you if you hadn’t heard the bell.
He wants to know what I had told the police.
Tom said that New York is/ was more lovely than London.
She said that he had turned out a good pianist.
She wondered if I was kidding.
She wrote to put up at that hotel.
I wanted to know where you were living then.
Пусть стоимость кг яблок х, тогда новая цена 1,2х. (1,2х потому что подорожали на 20 %, старая цена 100%+20% сумма удорожания итого 120% или 1,2)
стоимость 3 кг яблок была 3х.
значит за те же деньги теперь можно купить
3х/1,2х = 2,5 кг яблок
ответ: 2,5 кг яблок