Вопрос школьника по предмету Математика
Бригада из 12 человек должна была высадить цветы в парке за 4 часа,но 2 человека заболели и не пришли на работу.Сколько времени потребуется
бригаде, чтобы выполнить задание?
сроооооочно, заранее огромное спасибо
Ответ учителя по предмету Математика
пусть вся работа — 1,тогда один человек за 4 часа выполняет 1/12 всей работы, а за час- 1/12:4=1/48
10 человек,соответственно,выполнят за час- 10/48;5/24
значит всю работу они выполнят : 1: 5/24=1×24/5=4 4/5 часа или 4 часа 48 мин
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Eat well, feel great, look great!
We all want to be healthy.
What foods can help us with that?
Bread and Grains.
A balanced diet is based on bread and grains (foods like rice and cereal). These foods give you fibre, iron and vitamin B. At least 40% of what you eat every day should be types of food in this category.
Fruit and vegetables.
You should eat plenty of vegetables and fruit every day to make sure you get enough potassium and vitamins A, C and E.
Dairy products.
Types of food in this category, like milk and cheese, have lots of calcium and vitamin D. These two elements protect your bones. You should consume milk, cheese or yoghurt every day.
Meat, fish and beans.
This category also includes eggs and nuts. These types of food give you iron, magnesium and protein. While meat, such as chicken, is better for you than fatty, red meat.
Fats and oils.
A little oil every day (about five or six spoonfuls) is useful against heart disease.
Eat wisely. If you eat a balanced diet, you will feel great, look great, and always be healthy!
* 2 1/4 — это две целых одна четвертая*
If I talk to you now, I ___ the bus,(talk,miss)
If I __ the bus, I ___ late for work.(miss, be)
If I ___late for work, my boss ___ angry with me. (be, be)
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