The following table shows the number of units of product produced and sold by a company during six years.

Find the ratio of the total number of units sold in 2013 and 2015 to the number of units sold in 2015 and 2016?

The area of a triangle is 456 sq.cm and its height is 24 cm. The length of its base is

A boat takes half time in moving a certain distance downstream than upstream. what is the ratio between the rate in still water and the rate of current? 

Directions : What will come in the place of the question mark (?) in the following number series?

1  2  6  15  31  ? 

The greatest fraction out of $$ {2\over 5},{5\over 6},{11\over 12},and \ {7\over8}$$ is

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

A number consists of two digits and the digit in the ten's place exceeds that in the unit's place by 5. If 5 times the sum of the digits be subtracted from the number, the digits of the number are reversed. Then the sum of the digits of the number is:

If $$ {8x\over{2x^{2}+7x-2}}=1, x>0,$$ then what is the value of of $$ {x^{3}+{1\over x^{3}}}$$ ?