Quantitative Aptitude - Arithmetic Ability Questions

When a number is increased by 28, it becomes 107% of itself. What is the number?

What is the value of cosec 3π/4?

If 2x+4-2x+2=3, then the value of x?

A moving train passes a platform 50m long in 14 seconds and a lamp post in 10 seconds. The speed of the train (in km/h) is :

A merchant marks the price of his articles 30% above the cost price. He gives some discount on it and earns a profit of 13.75%. What is the discount percentage?

X and Y give an exam. Difference of their marks is 45 and the difference of their marks is 15% of the maximum marks. What is the maximum marks for the exam?

If ab-1b=cb-1c=ac-1a, then ac+ba+cb

If a3- b3= 91 and a - b = 1, then what is the value of ab?