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There are 2000 students in a college. Out of 2000 students some appeared in exams 'A','B' and 'C' While some not. Number of student not appered in any exam is equal to number of students appeared in exam 'C' only. Number of students appeared in exam 'B' us 720. Ratio of number of students appered in exam 'B' and 'C' only is 2:3 Number of students appeared in only exam 'C'. Number of student appeared in exam 'A' only is 50% more than number of students appeared in 'N' only. number of students appeared in all the three exam is 4% of the total number of students in the college. Number of students appeared in 'B' and exam only is same as number of students appeared in 'B' and 'C' only. How many students apperead in at least two exams ? |
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Answer» 480 Let, students appear in exam C only =a Total students appeared in exam B=720 Ratio of NUMBER appeard in exam B and C only =`2:3` Students appeared in exam A andC both =a/2 Numberof students appeared in all three exams `=(4)/(100)xx2000=80` Number of students appeared in B exam only = No. OFSTUDENTS appeared in B and C only = 3x Number of students appeared in exam A and B only `=(2)/(3)xx3x=2x` Now, `2x+3x+3x+80=720` `RARR x=80` and, ` 12.5x +a+(a)/(2)=2000` `(5a)/(a)=1000` `rArr a=400` Students appeared in alteast two exams `=160+120+80+240=260` |
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