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Sand gravel a cement mixed in 1:3:4 if you want 1600kg of concrete how much of each will you neeed. Give answer in kg

User Shenita
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2 votes

Answer:

200 kg of sand; 600 kg of gravel; 800 kg of cement

Explanation:

sand : gravel : cement = 1 : 3 : 4

If we multiply each number in the ratio by 10, we get:

10 + 30 + 40 = 80

That is too small since we want a sum of 1600.

What number do we multiply each number in the ratio by to get a sum of 1600? Let's call that number x.

1x + 3x + 4x = 1600

8x = 1600

x = 200

We need a factor of 20 for the numbers in the ratio.

200 × 1 = 200

200 × 3 = 600

200 × 4 = 800

Check: 200 + 600 + 800 = 1600

Answer: 200 kg of sand; 600 kg of gravel; 800 kg of cement

User Jettina
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