In an examination series, which consists of 5
exams, Arvind scored an average of 60 marks in
the first 3 exams and an average of 70 in the
last 4 exams, what is the average score of
Arvind for the first and last two exams if his
average scores of all the five exams are 65?

• let a,b,c,d,e be the five exams
  (a+b+c+d+e)/5=65
  a+b+c+d+e=325
  first 3 exams avg is (a+b+c)/3=60
  a+b+c=180
  d+e=325-180=145
  avg of last 4 exams is (b+c+d+e)/4=70
  b+c+d+e=280
  a=325-280=45
  avg of first and last two exams are(a+d+e)/3=(45+145)/3=(190)/3=63.33
  i think
• 9 years agoHelpfull: Yes(68) No(0)
• Let the marks scored in five exams be a,b,c,d,e.
  A/Q , (a+b+c)/3=60
  (b+c+d+e)/4=70
  (a+b+c+d+e)/5=65
  on solving we get
  a=45,d+e=145
  So,( a+d+e)/3 =63.3 Ans
• 9 years agoHelpfull: Yes(6) No(0)
• wrong answer mahima.. correct answer is 63.3333333
• 9 years agoHelpfull: Yes(2) No(3)
• Given
  e1+e2+e3=180
  e2+e3+e4+e5=280
  e1+e2+e3+e4+e5=325
  what is (e1+e4+e5)/3=?
  by solving above equations 2 and 3 we can get e1 as 45
  and from 1 and 3 we can get e4+e5 as 145
  by taking avg of e1,e4,e5 we can get 63.3
  sol: 63.3
• 9 years agoHelpfull: Yes(2) No(1)
• (avg of last 4 - avg of first 3)/1 + (avg of all 5 - avg of first 3)/2
  = ((60*30)-(70*4))/1 +((65*5)-(60*30))/2 = 172.5
• 9 years agoHelpfull: Yes(1) No(9)
• answer is 60 1st no is 45 and last no is 75 so avg is 60..
  
• 9 years agoHelpfull: Yes(1) No(3)
• avg of last two no is 72.5
  avg of first two is 52.5
• 9 years agoHelpfull: Yes(1) No(3)
• answer is 63.3
• 9 years agoHelpfull: Yes(1) No(0)
• pls give the explaination for this question
• 9 years agoHelpfull: Yes(0) No(3)