Question

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?

Answer 1

9514 1404 393

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.