Quantitative Aptitude - Arithmetic Ability Questions

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

If tan2A + cot2A + 2 = x, then the value of x is

If -3[1-(x/2)] + 5x/3 = 1/6, then what is the value of x?

What is the value of 13×7+17×11+111×15+...+1899×903 ?

By selling a used phone for Rs.6,160 Rajan got 44% less than what it cost him to buy it a few years ago. At what price should Rajan have been able to sell it to make a profit of 5%?

Present ages of Sai and Satheesh are in the ratio of 5:4 respectively. Three years hence, the ratio of their ages will become 11:9 respectively. What is Satheesh's present age in years?

In an arithmetic progression, if 9 is the 5th term, -26 is the 12th term, then -6 is which term?

30 men working 5 hours a day can do a task in 16 days. In how many days will 40 men working 6 hours a day do the same task?