Question 51

In a group of 100 students, every student studies 8 subjects and every subject is studied by 10 students. The number of subjects are :

Solution

every student studies 8 subjects, so 100 students studies $$100\times8\ subjects$$=800 and every subject is studied by 10 students so number of subjects =$$\ \frac{\ 800}{10}\ =80$$,

Hence option 'A' is correct.

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RRB Group-D 11th Oct 2018-shift -1

In a group of 100 students, every student studies 8 subjects and every subject is studied by 10 students. The number of subjects are :

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