Quantitative Aptitude - Arithmetic Ability Questions

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

If cosec2 θ = 625/576, then what is the value of [(sin θ – cos θ)/(sin θ + cos θ)]?

The average of 3 consecutive even numbers is A. If next 5 even numbers are added, then what is the average of these 8 numbers?

What is the value of (91 + 92 + 93 + ......... +140)?

The least value of tan2x + cot2x is

Ramesh sold a phone at a loss of 5%. Had he sold it for Rs. 200 more, he would gave gained 15%. To gain 25%, he should sell it for

If a2b+c=b2C+a=a2a+b=1 then 11+a+11+b+11+c is

If the selling price is Rs 728 after getting a discount of 9%, what was the marked price?