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

1. The problem says that the is ratio 1:3:5 by weight and Talil wants to make 180 kg of concrete mix.

 2. Therefore, you have:

 1+3+5=9

 180 kg/9=20 kg

 3. Each of the 9 parts of the ratio weights 20 kg. So, to make 180 kg of concrete mix, he needs:

 1x20 kg=20 kg of cement
 3x20 kg=60 kg of sand
 5x20 kg=100 kg of gravel

 4. Talil has:

 15kg of cement (Not enough)
 85kg of sand (More than enough)
 100kg of gravel (Enough)

 Does Talil have enough cement , sand and gravel to make concrete mix?

 The answer is: No, she does no have enough cement , sand and gravel to make concrete mix.