Question

A strong mortar is made from sand and cement in the ratio of 3:1
How many cement is needed to mix 90kg of sand

Answer 1

To determine the amount of cement needed to mix with 90 kg of sand in a 3:1 ratio (sand to cement), we first need to find the total parts in the ratio.

In a 3:1 ratio:
- Sand = 3 parts
- Cement = 1 part

This gives us a total of \(3 + 1 = 4\) parts.

Now, we can find out how much one part is in terms of weight. Since 90 kg of sand represents the 3 parts:

\[
1 \text{ part} = \frac{90 \text{ kg}}{3} = 30 \text{ kg}
\]

Now, since cement is 1 part, the weight of cement required is:

\[
Cement = 1 \text{ part} = 30 \text{ kg}
\]

Therefore, 30 kg of cement is needed to mix with 90 kg of sand.