Quantitative Aptitude - Arithmetic Ability Questions

One-third of Poojitha's age three years ago plus one-half of her age two years from now is twenty years. How old is she now?

What is the third proportional to 10 and 20?

If cos 2π/3c = x, then the value of x is

Select the odd letters from the given alternatives.

In a week, how many times are the hands of a clock at right angles with each other?

If a + b + c + d = 4, then the value of 1(1-a)(1-b)(1-c) + 1(1-b)(1-c)(1-d) + 1(1-c)(1-d)(1-a) + 1(1-d)(1-a)(1-b)

The cash difference between the selling price of an article at a profit of 4% and 6% is Rs. 3. The ratio of two selling prices is:

A tetrahedron has 4 vertices. How many edges does it have?