Final answer:
To find Ron's average course grade, we can set up an equation using the given information. By dividing the sum of his course grades by the number of courses he took, we can find Ron's average course grade to be 75.
Step-by-step explanation:
To find Ron's average course grade, we need to set up an equation using the information given. Let's say Ron's average course grade is x. We know that Alex's average course grade is 90 and she took 5 courses. So, the sum of her course grades is 90 * 5 = 450. Ron took 6 courses and has the same sum of course grades as Alex, so the sum of his course grades is also 450. Now, we can set up the equation:
(x * 6) = 450
Solving for x, we divide both sides by 6:
x = 450 / 6 = 75
Therefore, Ron's average course grade is 75.