Quantitative Aptitude - Arithmetic Ability Questions

If a boat goes upstream at a speed of 21 km/h and comes back the same distance at 28 km/h. What is the average speed (in km/hr) for the total journey?

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

The value of x13+x-13x23-1+x-23

What is the value of [(tan 5θ + tan 3θ)/4 cos 4θ (tan 5θ – tan 3θ)]?

If the selling price is Rs 2125 after getting a discount of 15% what was the marked price?

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 the value of 3-1.732, then calculate the value of 243-12108-147

A rectangular swimming pool of length 30 m and breadth 15 m has a uniformly sloping floor. It is 1 m in depth on one end of its length and 2 m at the other. How much water is needed to completely fill this pool?