Answer: Let's call the total number of action figures you need to complete your collection "x". Based on the information given, we know that 30 action figures is 40% of x, so we can write the equation:
30 = 0.40x
To solve for x, we'll divide both sides of the equation by 0.40:
x = 30 / 0.40
x = 75
So, the total number of action figures you need to complete your collection is 75. Since you purchase 5 action figures per week, it will take you 75 / 5 = 15 weeks to complete your collection.
Explanation: