If $$ {9^{x}={9\over {3^{x}}}}$$ then find the value of x.

Aman and Ajay can build a wall in 9 days and 12 days respectively. In how many days can they finish the work if they work together?

A car can finish a certain journey in 10 hours at a speed of 42 kmph. In order to cover the same distance in 7 hours, the speed of the car (km/h) must be increased by:

Speed of boat in downstream and upstream are 32km/hr and 23km/hr. Find the speed of current ?

LCM of two numbers is 2079 and their HCF is 27. If one of the numbers is 189, the other number is

If a = 7, b = 5 and c = 3, then the value of $$a^2+b^2+c^2-ab-bc-ca$$ is 

Directions: Find the wrong number in the following number series:

0.5, 2, 1, 4, 32, 512, 16384

Direction: Equation number I and II are given. You have to solve both the question and answer.
$$ {I.x^{2}={144}}$$
$$ {II.y^{2}-24y+144=0}$$