Quantitative Aptitude - Arithmetic Ability Questions

What will come in the place of question mark (?) in the following question (You do not have to calculate the exact value)?

53.01 - 345.02 ÷ 22.99 = 2 ×(?)

70% of the cost price of a article is equal to the 40% of its selling price. What is the profit or loss percentage?

The sum of the ages of father and a son presently is 70 years. After 10 years, the son's age is exactly half that of the father. What are their ages now?

The average of 6 consecutive integers is 15/2. What is the average of last three integers?

If 5 sec θ – 3 tan θ = 5, then what is the value of 5 tan θ – 3 sec θ?

Point A divides segment BC in the ratio 1:3. Co-ordinates of B are (4,-4) and C are (0,6). What are the co-ordinates of point A?

A man travels 404 kilometres in partly by rail and steamer. He spends 10 hours more time on steamer. If the speed of the steamer is 30 km/hr and the velocity of rail is 50 km/hr, how much distance does he cover by steamer?

A solid sphere has a radius 21 cm. It is melted to form a cube. 20% material is wasted in this process. The cube is melted to form hemisphere. In this process 20% material is wasted. The hemisphere is melted to form two spheres of equal radius. 20% material was also wasted in this process. What is the radius (in cm) of each new sphere?