List of top Quantitative Aptitude Questions on Divisibility Rules

Which of the following is correct for a number to be divisible by 8?
The sum of all possible values of \( K \) such that a 5-digit number 90K68 is divisible by 8 will be:
The number 311311311311311311311 is
How many five-digit numbers can be formed using the digits 2, 3, 8, 7, 5 exactly once such that the number is divisible by 125?
Number of students who have opted for subjects A, B and C are 60, 84 and 108 respectively. The examination is to be conducted for these students such that only the students of the same subject are allowed in one room. Also the number of students in each room must be same. What is the minimum number of rooms that should be arranged to meet all these conditions?