In a mixture of concrete, there are four lb of cement mix for each pound of gravel. if the mixture contains a total of 115 lb of these two ingredients, how many pounds of gravel are there
For this case, the first thing we must do is define variables: x: pounds of gravel y: pounds of cement We now write the system of equations: x + y = 115 y = 4x Solving the system of equations we have: x = 23 y = 92 Answer: there are 23 pounds of gravel
