There are red cars and blue cars in the parking lot. The ratio of blue to red is 11:6. There are 317 blue cars. How many red cars are in the parking lot? Round your answer to the nearest whole number.

A. 173 B. 172 C.53 D.581

Let's represent the number of red cars as "x".

Since the ratio of blue to red cars is 11:6, we can write the equation:
11/6 = 317/x
To solve for x, we cross multiply:
11x = 6 * 317
11x = 1902
Dividing both sides by 11:
x = 1902 / 11
x ≈ <<173=173>>173
Therefore, there are approximately 173 red cars in the parking lot. Answer: \boxed{\text{(A) 173}}.