If a triangle has a base on length B and a height of 2B, then the area of the triangle is :

The average age of 29 boys in the class is 14 years. When the age of the class teacher is included, the average becomes 15 years. The age of the class teacher is

In a class, there are 18 boys who are 160 cm tall. If these constitute 3 4 th of the boys and the total number of boys is 2/3rd of the total number of students in the class, then what is the number of girls in the class?

Ashok earns and income of Rs. 1 on the first day of his business. On every subsequent day, he earns an income which is just double of that made on the previous day. On the 10th day of his business, his income is :

The difference of the squares of two consecutive even natural numbers is 92. Find the larger of the two :

A copper sphere of radius 3 cm is beaten and drawn into a diameter of 0.2 cm. The length of the wire is :