There are 38 children whien the class started. 5 came in late.
Sometime later, 3 went to attend the Math Club meeting .
How many are in the class now?

In a class, 20 % of the children are members of the Math Club. There are 35 children in the class. How many are members of the Math Club?

A bulb of 60W in a classroom remains switched on for a long time from 9 am to 5 pm due to the negligence of students in the class If similar negligence had happened in 3 clasrooms, how many units of electric energy would have been wasted ?