We need 100 cubic feet of sand and 60 cubic feet of cement to make 160 cubic feet of concrete mix
Solution:
Given that, mixture of concrete is made up of sand and cement in a ratio of 5 : 3
To find: Cubic feet of sand and cement needed for 160 cubic feet of concrete mix
From given statement,
Sand : cement = 5 : 3
Let the sand needed be 5x
Let the cement needed be 3x
We need 160 cubic feet of concrete mix
Therefore,
sand needed + cement needed = 160
5x + 3x = 160
8x = 160
x = 20
Thus, sand needed = 5x = 5(20) = 100
cement needed = 3x = 3920) = 60
Thus we need 100 cubic feet of sand and 60 cubic feet of cement