Quantitative Aptitude - Arithmetic Ability Questions

In the following question, four number pairs are given. The number on left side of (–) is related to the number on 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

The angle of elevation of the top of a hill at the foot of the tower is 60 deg and the angle of elevation of the top of the tower from the foot of the hill is 30 deg. If the tower is 50 m high, what is the height of the hill?

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

Which one of the following is true for 0°<θ<90°

The distance between the points (7,7) and (k,-5) is 13. Find k?

If 4(2x + 3) > 5 -­ x and 5x - ­3(2x­ - 7) > 3x -­ 1, then x can take which of the following values?

If selling price is Rs. 72 and Gain percentage = 20%, calculate the Cost Price.

A sum of money (P) doubles in 10 years. How much would it be in 20 years at the same rate of simple interest?