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 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

Tanya got an increment of 15% in her salary. If her enhanced salary is Rs.14,030. What was her original salary?

The lengths of diagonals of a rhombus are 24cm and 10cm the perimeter of the rhombus (in cm ) is :

In ΔPQR, S and T are points on side PQ and PR respectively. ST is parallel to QR. If S divides PQ in the ratio 4:1 and length of QR is 15 cm,what is the length of ST?

If a + b = 1, then a4 + b4 - a3 - b3 - 2a2b2 + ab is equal to

If 15 persons can do a job in 30 days, then 30 persons with twice the efficiency can do the same job in how many days?

A cricketer, whose bowling average was 12.4 runs/wicket takes 5 wickets for 22 runs in a match, thereby decreases his average by 0.4. The number of wickets, taken by him before this match was:

The mean of 10 observations is 17. One more observation is included and the new mean becomes 16. The 11th observation is