Quantitative Aptitude - Arithmetic Ability Questions

What is the area (in sq cm) of a circle whose circumference is 22 cm?

An 80 litre mixture of water and acid contains 20% acid. How much acid should be added to make the acid 60% in the new mixture?

A boy in a train notices that he can count 31 telephone posts in 60 seconds. the distance between two posts is 60 meters. Calculate the speed of the train?

If ax + by = 1 and bx + ay = 2aba2+b2 then x2+y2a2+b2 is equal to

What is the value of cot210°?

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

Select the odd word/letters/number/number pair from the given alternatives.

Cost of 4 pens, 6 note books and 9 files is Rs 305. Cost of 3 pens, 4 notebooks and 2 files is Rs 145. What is the cost (in Rs) of 5 pens, 8 notebooks and 16 files?