A number consists of 2 digits.The sum of the digits is 7.If the digits are reversed,the number is increased by 27.The product of the digits of the number is

A's salary was increased by 40% and then decreased by 20%.On the whole A's salary is increased by

If tanθ+secθ=2,then tanθ is equal to

A pole is standing erect on the ground which is horizontal.The tip of the pole is tied tight with a rope of length √12m to a point on the ground.If the rope is making 30° with the horizontal,then the height of the pole is 

An aeroplane flying at a height of 3000m passes vertivally above another aeroplane at an instant when angles of elevation of two planes from some point on the ground is 60° and 45° respectively.Then the vertical distance of the two planes is 

If a and b are positive,then the relation sinθ=(2a+3b)/3b is