The average weight of students in a class is 43kg.Four new students are admitted to the class whose weights are 42kg,36.5kg,39kg and 42.5kg.Now the average weight of the students of the class is 42.5 kg.The number of students in the beginning was

How many right angles triangles can be formed by joining the vertices of a cuboid?

If x=91/216,then the value of 3-(1/(1-x)^1/3) is

The value of 32cot²(π/4)-8sec²(π/3)+8cos³(π/6) is equal to 

The minimum value of cos²x+cos²y-cos²z is

A clock is startd at noon.By 10 minutes past 5,through what angle the hour hand moves?