Quantitative Aptitude - Arithmetic Ability Questions

In the following question, four groups of three numbers are given. In each group the second and third number are related to the first number by a Logic/Rule/Relation. Three are similar on basis of same Logic/Rule/Relation. Select the odd one out from the given alternatives.

ΔDEF is right angled at E. If m∠F = 30 deg, then find the value of (sinD - 1/3).

Compute : (50 + 0.5 x 20) / 0.7

Amit is five years older than Vaibhav at present. After four years the ratio of their age will be 5:4. What is Amit age at present (in years)?

If the number x4441 is divisible by 11, what is the face value of x?

From the top of a platform 5 m high, the angle of elevation of a tower was 30 deg. If the tower was 45 m high, how far away from the tower was the platform positioned?

Find out the odd word/letters/number/number pair from the given alternatives.

A number is greater than twice its reciprocal by 31/4. Find the number.