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4 votes
4 votes
Henry is mixing concrete.

To make concrete he needs to mix cement, sand and gravel in the ratio 3 : 2 : 7 by weight.
Henry needs to make 180kg of concrete.
He has 46kg of cement, 29kg of sand and 105kg of gravel.
Which ingredient is Henry short of?

User Aaron Saray
by
3.0k points

1 Answer

15 votes
15 votes

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Answer:

1 kg of sand

Explanation:

For 180 kg of concrete using the given ratios, you need ...

(3/12)(180 kg) = 45 kg of cement

(2/12)(180 kg) = 30 kg of sand

(7/12)(180 kg) = 105 kg of gravel

The inventory of 29 kg of sand is 1 kg short of the amount needed.

Henry is short 1 kg of sand.

User Adam Cox
by
2.7k points
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