Question

На стройку привезли 120т цемента, песка в 2 раза больше, а щебёнки в 4 раза больше, чем цемента. для приготовления бетона израсходовали третью часть всех этих материалов. сколько материалов израсходовали?

Answer 1

120*2=240 (т) песка
120*4= 480 (т) щебня
120+240+480=840  всего
480:3= 280

Answer 2

Calculation of Materials Used

To calculate the amount of materials used for making concrete, we can use the information provided:

- 120 tons of cement were delivered. - The amount of sand is twice the amount of cement. - The amount of gravel is four times the amount of cement. - One-third of all these materials were used for making concrete.

Let's break down the calculations step by step:

1. The amount of sand is twice the amount of cement: 120 tons * 2 = 240 tons of sand. 2. The amount of gravel is four times the amount of cement: 120 tons * 4 = 480 tons of gravel. 3. The total amount of materials used for making concrete is the sum of cement, sand, and gravel: 120 tons + 240 tons + 480 tons = 840 tons. 4. One-third of all these materials were used for making concrete: 840 tons / 3 = 280 tons.

Therefore, the amount of materials used for making concrete is 280 tons.

I hope this helps! Let me know if you have any further questions.