High School

We appreciate your visit to Bob the builder is making 480 kg of concrete mix Concrete is made by mixing cement sand and gravel in the ratio 1 3 4. This page offers clear insights and highlights the essential aspects of the topic. Our goal is to provide a helpful and engaging learning experience. Explore the content and find the answers you need!

Bob the builder is making 480 kg of concrete mix.

Concrete is made by mixing cement, sand, and gravel in the ratio 1:3:4.

How much sand does he need?

Answer :

Final answer:

Using the given cement, sand, and gravel ratio of 1:3:4 for concrete, and the total weight of 480 kg, Bob needs 180 kg of sand for his concrete mix.

Explanation:

To find out how much sand Bob the builder needs for his concrete mix, we'll use the ratio given for cement, sand, and gravel, which is 1 : 3 : 4. This means for every 1 part of cement, there are 3 parts of sand and 4 parts of gravel. Together, the total parts of the mixture are 1 + 3 + 4 = 8 parts.

Since Bob is making 480 kg of concrete, we can calculate the weight of each part by dividing the total weight by the number of parts:

  • Total weight of concrete mix = 480 kg
  • Number of parts = 8
  • Weight of one part = 480 kg / 8 = 60 kg

Now, since the ratio of sand is 3 parts, to find the weight of sand needed, we multiply the weight of one part by 3:

  • Weight of sand = 3 parts x 60 kg/part = 180 kg

So, Bob will need 180 kg of sand for the concrete mix.

Thanks for taking the time to read Bob the builder is making 480 kg of concrete mix Concrete is made by mixing cement sand and gravel in the ratio 1 3 4. We hope the insights shared have been valuable and enhanced your understanding of the topic. Don�t hesitate to browse our website for more informative and engaging content!

Rewritten by : Barada

Bob needs 180 kilograms of sand to make 480 kg of concrete mix.

To determine how much sand Bob needs, we first need to understand the ratio in which cement, sand, and gravel are mixed, which is 1 : 3 : 4.

1. Total Parts in the Mixture:

The total parts in the mixture ratio are ( 1 + 3 + 4 = 8 ).

2. Calculate the Amount of Sand:

Since sand is 3 parts out of a total of 8 parts, we need to find out how much sand is needed for 480 kg of concrete mix.

3. Calculate Sand Needed:

[tex]\[ \text{Amount of sand} = \frac{3}{8} \times 480 \][/tex]

Calculate [tex]\( \frac{3}{8} \times 480 \)[/tex]:

[tex]\[ \text{Amount of sand} = \frac{3 \times 480}{8} \] \[ \text{Amount of sand} = \frac{1440}{8} \] \[ \text{Amount of sand} = 180 \][/tex]