If $$ {y\over {x-3}}={y+x\over 3}={x\over y}$$ then 3 : y : x equal to :

If a + b: b+c : c+a= 6:7:8 and a + b+c= 14, , then the value of c is : 

A spherical ball of lead 3 cm in diameter is melted and recast into three spherical balls The diameter of two of these are 1.5 cm and 2 cm respectively. The diameter of the third ball is 

An open box is made of wood 3 cm thick. Its external dimensions are 1.36 m, 1.06 m and 8.3 dm. The cost of painting the inner surface of the box at 50 paise per 100 sq. cm (in Rs.) is 

The length of a hollow thick cylindrical metallic pipe is 6 cm and its total surface area including the surface at the ends is 98π sq. cm. If the outer diameter is 8 cm, then the inner diameter in cm is 

The least number which must be subtracted from 2361 to make it a perfect square is

If (x + k ) is the common factor of x² + ax + b and x² + cx + d , then what is k equal to ?

What is the highest common factor of 2x³ + x² -x -2 and 3x³- 2x² + x - 2 ?