What value should come in place of the question mark (?) in the following question?

52x14+145018=1998÷?

In ∆ABC, ∡A + ∡B = 75 and ∡B + ∡C = 140, then ∡B =

An exterior angle of a triangle is 115 deg and one of the interior opposite angle is 45 deg. Then the other two angles are

The salary of a person is reduced by 20% . To restore the previous salary, his present salary is to be increased by

The angles of depression of two ships from the top of a light house are 45° and 30° toward east. If the ships are 200m apart, the height of the light house is (take √3=1.73)

A sum of Rs. 3000 amounts to Rs. 6000 in two years at compound interest. The interest for four years is

If cosA + cos2A = 1 then the value of sin2A + sin4A is

If the measures of the angles of a triangle are in the ratio. 1:2:3 and if the length of the smallest side of the triangle is 10cm, then the length of the longest side is

The length of a chord which is at a distance of 5cm from the centre of a circle of radius 13cm is