List of top Logical Reasoning Questions on Linear Equations

If the sum of two numbers is 10 and the difference of their squares is 20, then these numbers are:

Five years ago, A's age was three times B's age. At present, A's age is twice B's age. What is A's present age?

The sum of x, y, and z is 98. The ratio of x : y = 2 : 3, and the ratio of y : z = 5 : 8. What is the value of y?