A builder is going to mix concrete. He needs to mix cement, sand and gravel in the ratio 1:3:4 1 : 3 : 4\,1:3:4
The builder wants to make 240 kg of concrete.
The builder has: 40 kg of cement 100 kg of sand 150 kg of gravel
Does the builder have enough cement, sand and gravel to make the concrete? You must show all your working.