Question

7. Talil is going to make some concrete mix. He needs to mix cement, sand and gravel in the ratio 1 :3:5 by weight. Talil wants to make 180 kg of concrete mix. Talil has 15 kg of cement 85 kg of sand 100 kg of gravel Does Talil have enough cement, sand and gravel to make the concrete mix?​

Answer 1

x + 3x + 5x = 180

9x = 180

x = 20

20 kg cement, 60 kg sand, 100 kg gravel

Talil does not have enough cement (he has only 15 kg cement--he needs 20 kg cement). He does have enough sand and gravel.