The correct answer is:
45 cars.
Explanation:
Let x represent the total number of cars in Samuel's collection.
We know that 27 is 60% of the total. We write 60% of the total as 0.6x. Since this is 27, this gives us the equation
0.6x = 27
Divide both sides by 0.6:
0.6x/0.6 = 27/0.6
x = 45