List of top Arithmetic and Mental Ability Questions on Number System

The smallest number among the fractions 3/5, 5/9, 7/11, 9/13 is
The product of three consecutive positive integers is 120. Then the sum of the three positive numbers is?
If you divide the number 1003 by 5, then the remainder is equal to
John has 12 red pencils and 15 blue pencils. He wants to bundle them into groups of the same size, with no pencils left over. What is the largest number of pencils that can be in each bundle?
A shoe seller has 1000 shoes in his shop. He wants to arrange them in a rack in such a way that the number of rows and columns remains the same. What is the minimum number of shoes he needs more for this purpose?
Find the missing number in the series 2, 6, 14, 30, ?, 126
John has two pieces of rope, one is 18 meters long and the other is 15 meters long. He wants to cut them into smaller pieces of equal length without any rope left over. How many pieces will he have in total?