A Student got 78 marks in avg of 4 subjects.the avg odf 5 subjects is 80.what is the amrk he got in 5th subject.

• avg mrk he got in 5th subject=80*5-78*4
  avg mrk he got in 5th subject=400-312=88(ans)
• 12 years agoHelpfull: Yes(21) No(0)
• Ans 88
  Marks of 5th subject=(total marks 0f 5 subjects)-(total marks 0f 4 subjects)
  =(5*80)-(78*4)=400-312=88
• 12 years agoHelpfull: Yes(4) No(1)
• (x1+x2+x3+x4)/4=78
  x1+x2+x3+x4=312---->1
  (x1+x2+x3+x4+x5)/5=80
  (x1+X2+x3+x4+x5)=400--->2
  eq2-eq1=88
• 10 years agoHelpfull: Yes(2) No(0)
• 
  5x80=400 for 5 subjects
  4x78=312 for 4 subjecs
  now 400-312=88 marks
• 10 years agoHelpfull: Yes(0) No(0)
• 4subject marks are,
  78*4=312
  5 subject marks are,
  80*5=400
  so,she got in 5th subject is,
  400-312=88
  then,88 is answer
• 10 years agoHelpfull: Yes(0) No(0)
• avg marks he got in 5th subjecttotal of 5 subject-total of 4 subjectwe know avg totalnumber of elementsso totalavgnumber of elementstotal of 5 subject805400total of 4 subject784312now marks he got in 5th subject400-31288Answer will be 88
• 10 years agoHelpfull: Yes(0) No(0)
• 400-312=88
  
• 10 years agoHelpfull: Yes(0) No(0)
• 78*4=312
  80*5=400
  (-)
  =88
  
• 8 years agoHelpfull: Yes(0) No(0)
• total nu=x;
  x/4=78;
  x=4*78=312;
  then 2nd part..
  x+312/5=80;
  x=(5*80)-312;
  x=88; ans
• 7 years agoHelpfull: Yes(0) No(0)