Quantitative Aptitude - Arithmetic Ability Questions

The mean of 10 observations is 17. One more observation is included and the new mean becomes 16. The 11th observation is

BE and CF are two altitudes of a triangle ABC. If AB = 6 cm , AC = 5 cm and CF = 4 cm , then the length of BE is

In what time will a 100 metre long train running with a speed of 50 km/hr cross a pillar?

The ratio of present ages of Ranjini and Shahid is 5:4. After 13 years the ratio of their ages will be 6:5. What is Ranjini's present age?

Divide 20 into two parts such that the sum of the square of the parts is 232. What is the value of the two parts?

Find the area (in cm²) of a semi-circle of radius 35 cm.

If 1/√(cosec2A - 1) = x, then value of x is

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