Предмет: Алгебра, автор: Hari666

если 15% от целого числа А-это целое число,то А делится на 20

Ответы

Автор ответа: mefody66

15% от целого числа А = 0,15А.
Пусть A = x*y, тогда 0,15A = 0,15x*y
Чтобы оно было целым, 0,15x должно быть целым.
Наименьшее x = 20, потому что 0,15*20 = 3
A = 20y - оно действительно делится на 20.

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Английский язык, автор: qween1572

Accident at the river bank
It was a lovely day when we (0) off with great excitement on our (13) into the
forest. We had no idea that the day would turn (14) one of the worst days of our lives. We
followed the track along the river into the centre of the forest, where we had planned to rest and go
swimming under the waterfall there. We were really looking (15)_ to this part
(16) we were eating our lunch, it started to rain. It wasn't heavy at first but, once the
thunder came, the rain became heavier and heavier. Suddenly, there was a terrifying roar and I shouted
to everyone to (17) away from the river bank and run as fast as they could. The next thing I
knew, I was being swept down the river by a mountain of (18) water. It seemed to go on
forever, but then I found myself clinging to a tree, gasping for breath. I was absolutely (19)
and could hardly move. Then I finally succeeded (20) getting to dry ground and lay there trying
to (21) out how far I'd been taken. Where were my friends? Were they OK? Suddenly, I heard
someone shouting my name, and there they all were, completely dry. I had been the only one who
had been washed away. It took us all a long time to get (22) the experience and I still refuse to
go near giver banks, even on sunny days!
13. 1) trip
2) travel
3) break
4) voyage
14.1) out
2) into
3) over
4) off
15. 1) forward 2) for
3) at
4) out for
16. 1) After 2) During 3) Afterwards 4) While
17.1) get
2) make
3) take 4) set
18. 1) enormous 2) freezing 3) exhausted 4) terrible
19. 1) scary 2) confident 3) starving 4) exhausted
20.1) on
2) at
3) in
4) by
21.1) make 2) set
3) get
4) work
22. 1) over
2) out
3) on
4) off

6 лет назад

Предмет: Математика, автор: esonina21

найти облость определения функции y=√4-3x

6 лет назад

Предмет: Математика, автор: scammel

Реши и найди наименьшее неотрицательное целое решение неравенства |x – 2| + 3 < 7.

6 лет назад

Предмет: Биология, автор: milanashchutsk

каковы особенности строения водных растений в связи с условиями обитания

9 лет назад

Предмет: Математика, автор: Незнакомка3006

Помогите решить задачу:В первый день в магазине продали 5/9(дробь) завезённой ткани,во во второй-35%,в третий-остальные 52 м.Сколько метров ткани завезли в магазин?

9 лет назад