Quantitative Aptitude - Arithmetic Ability Questions

A and B undertake a piece of work for Rs. 250 . A alone can do that work in 5 days and B alone can do that work in 15 days . With the help of C, they finish the work in 3 days . If every one gets paid in proportion to work done by them, the amount C will get is 

Working together, pipes A and B can fill an empty tank in 10 hours. They worked together for 4 hours and then B stopped and A continued filling the tank till it was full. It took a total of 13 hours to fill the tank. How long would it take A to fill the empty tank alone?

If a2+1=9a, (a≠0) then the value of a2+1a2 is

If sinA/(1 + cosA) = x, then x is

What is the value of equation a3+b3+c3-3abc if a2+b2+c2=ab+bc+ca+4 and a+b+c = 4.

The sum for 2 years gives a compound interest of Rs 3225 at 15% rate. Then sum is

In the following question, four groups of three numbers are given. In each group the second and third number are related to the first number by a Logic/Rule/Relation.Three are similar on basis of same Logic/Rule/Relation. Select the odd one out from the given alternatives.

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