There are two groups A and B of a class, consisting of 42 and 28 students respectively . If the average weight of group B is 40 kg, find the average weight of the whole class.
A person can think 100 line of code in 5min and can type 100 lines of code in 10min he takes 5min break for every 10min.in one hour how many pages he can type.
In an examination,a student gets 5 marks for every right answer and loses 2 marks for every wrong answer.If he answers 50 questions and get 124 marks, how many are correct answers he attempted?
A teacher gave a student the task of adding āNā natural numbers starting from 1. After a while, the student reported his result as 700. The teacher replied that his result was wrong. The student realized that
he had added one number twice by mistake. Find the sum of the digits of the number which the student had added twice.