Quantitative Aptitude - Arithmetic Ability Questions

If -3/2 + (2/3)(3x + 9) = x/2, then what is the value of x?

The point P(a,b) is first reflected in origin to P1 and P1 is reflected in y-­axis to (6,­-5). The co-­ordinates of point P are

The average marks obtained by a group of 10 students were 20. One student left the group as a result of which the average of the remaining students rose to 21. But another student joined, as a result of which the average marks of the group dropped a bit and became 20.6. What were the average marks obtained by the student who left and the one who joined?

A batsman in his 12th innings makes a score of 120, and thereby increase his average by 5. The average score after 12th innings is

If a+b-62+a2b2+1+2b=2ab+2a, then the value of a is 

The median of the numbers 14, 12, 12, 16, 13 and 18 is

Diameter of a car wheel is 21 cm. A car driver moving at the speed of 66 km/hr takes 36 seconds to reach a destination. How many revolutions will the wheel make during the journey?

Mohan earns a profit of 20% on selling a jean at 15% discount on printed price. The ratio of the cost price to printed price of the jean is