Quantitative Aptitude - Arithmetic Ability Questions

When [x + (1/x)] = 5, then what is the value of [x – (1/x)]?

The variance of a set of data is 121. Then the standard deviation of the data is

Three runners A,B and C run a race, with runner A finishing 12 meters ahead of runner B and 18 meters ahead of runner C, while runner B finishes 8 meters ahead of runner C. Each runner travels the entire distance at a constant speed. The length of the race is

The slope of the line passing through the points (-5,1) and (x,-4) is -5/8. Find x.

A cylindrical vessel of radius 8 cm is partially filled with water. By how much will the water level rise if a sphere of radius 7 cm is completely immersed in this water?

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.

If the length of one side and the diagonal of a rectangle are 10 cm and 26 cm respectively, then find its perimeter (in cm).

If 1/√(1 + cot2A) = x, then value of x is