The Correct Answer is (A)
We can solve this problem by utilizing using the shared variable in the two equations provided. Both equations share the variable y, so we can find the ratio of x to z if we set the y values equal to one another. From both equations, we can create 20y. In the first,
And in the second,
Since 20y = 20y, then 8x =15z, so the ratio of x to z is 8:15. The correct answer choice is A.