Book Maths Puzzle

A student's mark was wrongly entered as 83 instead of 63. Due to that the average marks for the class got increased by half 1/2. What is the number of students in the class?

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Book Other Question

What will be the length of the longest rod which can be placed in a box of 80 cm length, 40 cm breadth and 60 cm height? There are two divisions A and B of a class, consisting of 36 and 44 students respectively. If the average weight of divisions A is 40 kg and that of division b is 35 kg. What is the average weight of the whole class?