Concrete is made by mixing cement and sand in the ratio 3:1:15 how much sand would be needed to make 125 tonnes of concrete

i need the workin out

3:1:15 requires three quantities.

To find out how much sand is needed to make 125 tonnes of concrete, we need to calculate the ratio of sand in the total mixture.

The given ratio is 3:1:15, which means the total ratio is 3+1+15 = 19 parts.

To find the proportion of sand in the mixture, we divide the volume of sand by the total ratio:

Proportion of sand = (1 part / 19 parts)

Now, we can calculate the amount of sand needed:

Amount of sand = (proportion of sand) x (total weight of concrete)

Amount of sand = (1/19) x 125 tonnes

Calculating this equation, we get:

Amount of sand = 6.58 tonnes

Therefore, approximately 6.58 tonnes of sand would be needed to make 125 tonnes of concrete.

To determine the amount of sand needed to make 125 tonnes of concrete, we need to use the given ratio of cement, sand, and total mixture.

The ratio provided is 3:1:15, which means for every 3 parts of cement, 1 part of sand, and 15 parts of the total mixture.

Let's calculate the total parts first:
3 + 1 + 15 = 19

Now, we can determine the proportion of sand in the mixture:
1 part of sand / 19 parts of the mixture

To find the amount of sand needed for 125 tonnes of concrete, we multiply the proportion of sand by the total weight of the concrete:

(1/19) x 125 tonnes = 6.58 tonnes

Therefore, approximately 6.58 tonnes of sand would be needed to make 125 tonnes of concrete.