SASMO 2027 · Grades 4-5 · SET 002 · Self-study Question 4

A building has 20 doors numbered 1 to 20. Alex opens all the doors. Bin closes every door whose number is divisible by 2. Cindy closes every door whose number is divisible by 3. Denny closes every door whose number is divisible by 5. How many doors are closed?



Enter the numerical answer only.