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The average score in Mathematics of 90 students of sections A and B of class IX was 63. The number of students in A were 10 more than those in B. The average score of students in A was 30% more than that of students in B. The average score of students in B is:
- a)60
- b)50
- c)54
- d)56
Correct answer is option 'C'. Can you explain this answer?
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The average score in Mathematics of90students of sectionsAandBof class...
Given:
Number of students =90
Students in A = Students in B+10
Average of the score in Mathematics of students in A and B=63
Average of students in section A=130% of students in section B.
As we know,
Let the students in section B be x
Students in section A = x + 10
Sum of the score of students =90×63
Sum of the score of students =5670
Number of the students =90
⇒x+x+10=90
⇒x=40
Students in Section B=40
Students in section A=40+10=50
Let the average be 'p'.
Average of students in section A=130% of students in section B
⇒13p×50+10p×40=5670
⇒650p+400p=5670
⇒1050p=5670
⇒p=5.4
Average of students in section B=10p
=5.4×10
=54
∴ The average score of students in B is 54.
Number of students =90
Students in A = Students in B+10
Average of the score in Mathematics of students in A and B=63
Average of students in section A=130% of students in section B.
As we know,
Let the students in section B be x
Students in section A = x + 10
Sum of the score of students =90×63
Sum of the score of students =5670
Number of the students =90
⇒x+x+10=90
⇒x=40
Students in Section B=40
Students in section A=40+10=50
Let the average be 'p'.
Average of students in section A=130% of students in section B
⇒13p×50+10p×40=5670
⇒650p+400p=5670
⇒1050p=5670
⇒p=5.4
Average of students in section B=10p
=5.4×10
=54
∴ The average score of students in B is 54.
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The average score in Mathematics of90students of sectionsAandBof class IX was63. The number of students inAwere10more than those inB. The average score of students inAwas30%more than that of students inB. The average score of students inBis:a)60b)50c)54d)56Correct answer is option 'C'. Can you explain this answer?
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The average score in Mathematics of90students of sectionsAandBof class IX was63. The number of students inAwere10more than those inB. The average score of students inAwas30%more than that of students inB. The average score of students inBis:a)60b)50c)54d)56Correct answer is option 'C'. Can you explain this answer? for RRB NTPC/ASM/CA/TA 2024 is part of RRB NTPC/ASM/CA/TA preparation. The Question and answers have been prepared according to the RRB NTPC/ASM/CA/TA exam syllabus. Information about The average score in Mathematics of90students of sectionsAandBof class IX was63. The number of students inAwere10more than those inB. The average score of students inAwas30%more than that of students inB. The average score of students inBis:a)60b)50c)54d)56Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for RRB NTPC/ASM/CA/TA 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The average score in Mathematics of90students of sectionsAandBof class IX was63. The number of students inAwere10more than those inB. The average score of students inAwas30%more than that of students inB. The average score of students inBis:a)60b)50c)54d)56Correct answer is option 'C'. Can you explain this answer?.
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