Question

На стройку привезли 120т цемента, песка- в два раза больше, а щебёнки- в 4 раза больше, чем цемента. Для получения бетона израсходовали третью часть всех этих материалов. Сколько всего бетона получили? Срочно!

Answer 1

1)120*2=240(т)-песка.
2)(120+240)*3:4=120+240=360*3=1080:4=270(т)-понадобится бетона.

Answer 2

120×2=240
120×4=480
120+240+480=840
840÷3=280

Answer 3

Calculation of Concrete Quantity

To calculate the total amount of concrete obtained, we need to determine the quantities of cement, sand, and gravel used and then calculate one-third of each of these quantities.

Given the following information: - Cement: 120 tons - Sand: twice the amount of cement - Gravel: four times the amount of cement

We can calculate the quantities as follows:

- Sand: 2 * 120 tons = 240 tons - Gravel: 4 * 120 tons = 480 tons

Now, let's calculate one-third of each of these quantities:

- Cement: 120 tons * (1/3) = 40 tons - Sand: 240 tons * (1/3) = 80 tons - Gravel: 480 tons * (1/3) = 160 tons

Therefore, the total amount of concrete obtained is the sum of these quantities:

- Total concrete = 40 tons + 80 tons + 160 tons = 280 tons.

So, a total of 280 tons of concrete was obtained.