Quantitative Aptitude - Arithmetic Ability Questions

A shopkeeper allows a discount of 20% to his customers and still gains 25%. Find the Marked price of an article which costs Rs.600 to the shopkeeper.

A student multiplied a number by 3/10 instead of 10/3. What is the percentage error in the calculation?

In the following question, select the odd word pair from the given alternatives.

The sum of length, breadth and height of a cuboid is 22 cm and the length of its diagonal is 14 cm.
If S is sum of the cubes of the dimensions of the cuboid and V is its volume, then what is (S-3V) equal to?

A can do a work in 21 days and B in 42 days. If they work on it together for 7 days, then what fraction of work is left?

What number should be added to each of the numbers 35, 115, 53 and 165, so that the resulting numbers are in continued proportion?

A cloth merchant has announced 25% rebate in prices. If one needs to have a rebate of Rs. 40, then how many metres of cloth costing Rs. 32 per metre he should purchase 

The point of intersection of all the three medians of a triangle is called its