Quantitative Aptitude - Arithmetic Ability Questions

If the radius of the cylinder is increased by 25%, then by how much percent the height must be reduced, so that the volume of the cylinder remains same?

A starts a business, after 6 months B also join him with Rs.4500 and after 2 months of B’s joining C also join them with Rs.4500. If A gets approx. Rs 4900 out of total annual profit of Rs. 10,000 then find the approximate value of initial investment of A.

2 is what percent of 50?

75 pupils from a school appeared for an examination and 80% of them passed. Another school entered 10 more pupils than the first school and five pupils less than the first school passed. The pass % of in the second school was :

In the given figure, O is centere of the circle. Circle has 3 tangents. If angle QPR = 45 deg, then what is the value (in deg) of angle QOR ?

P can complete a work in 15 days and Q in 24 days. They began the work together, but Q left the work 2 days before its completion. In how manydays, was the work completed?

Findout the odd word/letters/number/number pair from the given alternatives.
23 : 8 : : 62 : ?

If (1 + cosA)/2 = x, then the value of x is