Quantitative Aptitude - Arithmetic Ability Questions

Which of the following ratio correctly depicts the division of each median of the triangle by the centroid?

n an alloy, lead and tin are in the ratio of 2 : 3. In the second alloy, the ratio of same elements is 3 : 4. If equal quantities of these two alloy are mixed to forma new alloy, then what will be the ratio of these two elements in the new alloy? 

A cylinderical container of 32 cm height and 18 cm radius is filled with sand. Now all this sand is used to form a conical heap of sand. If the height of theconical heap is 24 cm, what is the radius of its base?

How many diagonals are there in octagon?

If the volume of a cylinder is 385 cubic cm and height is 10 cm, find its radius?

The area of a circle is 38.5 cm2. Find its circumference (in cm).

A flask has two holes. The 1st hole alone makes the flask empty in 9 minutes and 2nd hole alone makes the flask empty in 16 minutes. If water leaks out at a constant rate, how long in minutes does it take if both the holes together empty the flask?

What is the sum of the first 11 terms of an arithmetic progression if the first term is -31 and last term is 29?