C-05-Q134: As many students in a class, each contributes equal to the number of c… | প্রশ্ন করি

C-05-Q134mediumsingle_mcq

As many students in a class, each contributes equal to the number of class-mates. Total Tk. $420$ collected. Number of students is—

If there are $n$ students, each contributes as many taka as the number of classmates, i.e. $(n-1)$ , giving $n(n-1)=420$ . Solving gives , so .

134/170

এই অধ্যায়ের আরও প্রশ্ন

C-05-Q135In question 134, each student contributed—
C-05-Q136Each of students contributes paisa more than the number of students. Total Tk. . Then —
C-05-Q137A two-digit number has digit sum . Reversing the digits gives a number more than the original. Original number
C-05-Q138In question 137, with units digit and tens digit , the relation between digits is—
C-05-Q139Mr. Karim invested part of Tk. at and rest at for years; total interest Tk. . Money at is—
C-05-Q140In question 139, the ratio of principal at to that at is—
C-05-Q141When Nabil's age was the same as Shuva's present age, Nabil was twice Shuva's age. When Shuva will be Nabil's
C-05-Q142In question 141, present age of Shuva is—

n^2-n-420=0

n^{2} - n - 420 = 0

(n-21)(n+20)=0

n=21

C-05-Q143