For the following questions answer them individually
The mid points of AB and AC of a triangle ABC are respectively X & Y. If BC + XY = 12 units, then the value of BC - XY is:
The difference between two numbers is 9 and the difference between their squares is 207. The numbers are
The average of 20 numbers is calculated as 35. It is discovered later on that while calculating the average, one number, namely 85, was read as 45. The correct average is
Radius of the in-circle of an equilateral ΔABC of sides $$2\sqrt3$$ units is x cm. The value of x is
If the angle of elevation of a cloud from a point 200 m above a lake is 30° and the angle of depression of its reflection in the lake is 60°. Then the height of the cloud above the lake is