Quantitative Aptitude - Arithmetic Ability Questions

What is the mean of the first five Triangular Numbers?

The vertical angle A of an isosceles triangle ΔABC is three times the angle B of it. The measure of the angle A is

The salary of a person is reduced by 20% . To restore the previous salary, his present salary is to be increased by

An angle is four times its complementary angle. What is the measure of the angle?

What is the total number of points in the plane of triangle ABC which is equidistant from the vertices of the triangle?

The mean of a distribution is 21 and the standard deviation is 7. What is the value of the coefficient variation?

Find the odd words/letter/number from the given alternatives:

In the following question, four number pairs are given. The number on left side of (–) is related to the number of the right side of (–) with some Logic/Rule/Relation. Three are similar on basis of same Logic/Rule/Relation. Select the odd one out from the given alternatives.