Quantitative Aptitude - Arithmetic Ability Questions

In a 200 metres race A beats B by 35 m or 7 seconds. A's time over the course is:

In the following question, select the odd letter/letters from the given alternatives.

In the following question,select the missing number from the given alternatives.

7, 26, ?, 124, 215, 342

Select the figure which does NOT belong to the group.

Select the figure which does not belong to the group.

What value should come in place of the question mark (?) in the following question?

68 x ? - 3421 = 591

A Contractor employed a certain number of workers  to finish constructing a road in a certain scheduled time. Sometime later, when a part of work had been completed, he realised that the work would get delayed by three-fourth of the  scheduled time, so he at once doubled the no of workers and thus he managed to finish the road on the scheduled time. How much work he had been completed, before increasing the number of workers?

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