If a+b=3 then the value of a3+b3+9ab-­27 is

If the average age of four children is 12 years and the average age of these children and their fathers is 20 years, what is the age of the father?

The value of 3x9n+1+9x32n-19x32n-6x9n-1 is equal to

Which one of the following is true for 0°<θ<90°

Three angles of a quadrilateral are 60°,90°and 100°. Then the fourth angle of the quadrilateral is

If sinA + sin2A = 1 then what is the value of cos2A + cos4A ?

If 4r = h + r2+h2 then r: h = ? (r not equal to 0)

If 5x + 1/x = 10, then x2 + 125x2 is equal to