Terry is going to make some concrete mix. He needs to mix
cement, sand and gravel in the ratio 2 . 3 : 5 by weight. He
estimates he needs to make 220 kg of concrete mix.
Terry has:
• 50 kg of cement
• 90 kg of sand
• 100 kg of gravel
Does Terry have enough cement, sand and gravel to make the
concrete mix?

No

Step-by-step explanation:

Sum the parts of the ratio, 2 + 3 + 5 = 10 parts

Divide 220 Kg by 10 to find the value of one part of the ratio.

220 Kg ÷ 10 = 22 Kg ← value of 1 part of the ratio, thus

2 parts = 2 × 22 = 44 Kg ← quantity of cement needed

3 parts = 3 × 22 = 66 Kg ← quantity of sand needed

5 parts = 5 × 22 = 110 Kg ← quantity of gravel needed

He has the required amounts of cement and sand but not of gravel.

Thus he cannot mix the concrete