Quantitative Aptitude - Arithmetic Ability Questions

The least number that must be substracted from 63520 to make the result a perfect square is

AB is a chord of the circle and its center is “O”. ON is perpendicular to AB. If the length of AB=20 cm, ON-(2√11) cm, find the radius (in cm) of the circle.

A sphere has the same curved surface area as a cone of vertical height 40 cm and radius 30 cm. The radius of the sphere is

A student, by mistake, wrote 64 in place of 46 as a number at the time of finding the average of 10 given numbers & got the average as 50. The correct average of the numbers is

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

If (tanA + tanB)/(1 ­ tanAtanB) = x, then the value of x is

If (9 - 3x) - (17x - 10) = -1, then the value of x is

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