List of top General Aptitude Questions on Average asked in GATE AG

The average marks obtained by a class in an examination were calculated as 30.8. However, while checking the marks entered, the teacher found that the marks of one student were entered incorrectly as 24 instead of 42. After correcting the marks, the average becomes 31.4. How many students does the class have?
To construct a wall, sand and cement are mixed in the ratio \(3:1\). The costs per unit of sand and cement are in the ratio \(1:2\). If the total cost of sand and cement is ₹~1000, what is the cost (in rupees) of cement used?