Quantitative Aptitude - Arithmetic Ability Questions

If cosx.cosy + sinx.siny = -1 then cosx + cosy is

What is the value of (cos45° + 1/3) ?

An hour-long test has 60 problems. If a student completes 30 problems in 25 minutes, then the required seconds he has taken on average for computing each of the remaining problems is

Average of the marks of 132 students of a college is 40. If the average of the marks of the passed students is 42 and the average of the marks of the failed students is 20, then what will be the respective ratio of the total marks of passed students and the total marks of failed students?

The total surface area of a hemisphere is 166.32 sq cm, find its radius?

What is the altitude of an equilateral triangle whose side is 12 cm?

Karteek is twice as good a foreman as Raju and together they finish a piece of work in 20 days. In how many days will Raju alone finish the work?

What is the compound interest on Rs. 48,000 for 2 years at 20% p.a., if interest is compounded annually?