The average of the squares of First 'n' natural numbers starting from 1 is 130 . Then , what is the average of the cubes of these first n natural numb...

Three solutions of Bhang have respective content of 1% , 2% , & 3% concentrated bhang . If Ravi wants to make a 1.5% solution , the ratio of solut...

A tank contains 20 litres of pure milk . Mr B takes out 4 litres of milk from the tank and replaces it with water . Then again he takes out 4 litres o...

A tells B , when I was 3/5th of your present age you were 5/7th of my present age . Present age of A is 28 years . B's Present age is ?

In an office, there are n employees and their average age is 36 years. After two years, 5 employees whose average age is 40 years, leave the office an...

The perimeter of an isoceles right triangle is 2k , what is its area ? Let the area of a triangle T be numerically equal to its perimeter. Find the ...

Sorry I meant between A & B options .