Determine the number of three digits number N divisibly by 11, and N/11 is equal to the sum of squares of the digits of N
In a class, every boy is friends with exactly four girls and every girl is friends with exactly three boys. lt is known that there are only 17 desks in the classroom, each of which can hold not more than four students. If there are 59 students in the class who Study German, find the number of students in the class.
In the above question, what could be the minimum possible number of questions prepared?