Quantitative Aptitude - Arithmetic Ability Questions

P and Q can do a project in 6 and 12 days respectively. In how many days can they complete 25% of the project if they work together?

A race has three parts. The speed and time required to complete the individual parts for a runner is displayed on the following chart:
                       

                         Part I     Part II       Part III

Speed (kmph)       9            8              7.5

Time (minutes)     50          80             100

The average of 25 consecutive odd integers is 55. The highest of these integers is

If two successive discounts of 20% and 30% are given, then what is the net discount (in %)?

A, B and C start a business and the ratio of their investment is 8 : 5 : 3. If at the end the ratio of their profits is 4 : 15 : 6, then what is the ratio of time period of their investment?

The length of the radius of the circumference of a triangle having sides 9 cm, 12 cm and 15 cm is

A parallelogram PQRS, the length of whose sides are 8 cm and 12 cm, has one diagonal 10 cm long Ile length of the other diagonal is approximately:

If cot2A -­ cos2A = x, then value of x is