The city library donated some books to a class. If each student takes 4 books, there will be 20 books left. If 3 students do not take a book and the rest of the students take 5 books each, there will be no books left. How many books were donated to the class?
Solution
Correct Answer: Option C
মনেকরি, মোট দানকৃত বই= x
এবং মোট ছাত্র সংখ্যা =y
প্রশ্নমতে ,4y+20=x..........i
এবং 5(y-3)=x
বা,5y-15=x...........ii
i × 5-ii×4
20y+100=5x
20y -60=4x
......................
160=x
x=160
মোট বইয়ের সংখ্যা 160 টি
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