Quantitative Aptitude - Arithmetic Ability Questions

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

If a+1a=1,then the value of a2-a+1a2+a+1 is a≠0

What is the quotient when 7251 is divided by 66?

Of the 3 numbers whose average is 72, the first is 2/7 times the sum of other 2. The first number is

Two trains are moving in opposite directions with the same speed. If the length of each train is 120 metres and they cross each other in 12 seconds, then what is the speed (in km/hr) of each train?

Find length of the arc whose central angle is 90° and radius of the circle is 3.5 cm?

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

Daily local train ticket costs Rs 30 and Monthly Pass costs Rs 670.8. If I buy the Monthly Pass and travel for 26 days in a month than I save?