Quantitative Aptitude - Arithmetic Ability Questions

The HCF of 20, 28 and 48 is

If three successive discounts of 20%, 30% and 40% are given, then what will be the net discount (in percentage)?

The difference between simple and compound interest (compounded annually) on a sum of money for 3 years at 10% per annum is Rs. 93. The sum (in Rs.) is:

A number is greater than 58 times its reciprocal by 3/4. What is the number?

If 9x = 24311, then what is the value of x?

In a triangle ABC, a line is drawn from C which bisects AB at point D. Find the ratio of area of the triangles DBC and ABC.

What is the reflection of the point (4, 7) in the line y = -1?

If x = (a/b) + (b/a), y = (b/c) + (c/b) and z = (c/a) + (a/c), then what is the value of xyz – x2 – y2 – z2?