The average age of 5 girls is 7. The oldest among them is 15 years old. What is the average age of others?

• sum of ages of girls = 35
  sum of ages of rest of 4 girls=20
  average=20/4=5
• 10 years agoHelpfull: Yes(18) No(1)
• (g1+g2+g3+g4+g5)/5=7
  g1+g2+g3+g4+g5=35
  one of the girl having age 15
  g1+g2+g3+g4=20
  avg of rest of the girls
  (g1+g2+g3+g4)/4=20/4
  =5
• 10 years agoHelpfull: Yes(6) No(2)
• Let total 5 girls age is x.
  Then x/5=7
  then x=35.
  so in the 5 girls, oldest one among them is 15 years old.
  
  So from total 35 we need to decrease 15 in order to find remaind 4 girls average.
  So 35-15=20
  So 4 girls average is 20/4=5.
  So the average age of others is 5
• 10 years agoHelpfull: Yes(6) No(0)
• so simple....
  
  ans: 5
• 10 years agoHelpfull: Yes(0) No(0)
• Let the other four girls ages be x, x, x, x
  (15+x+x+x+x)/7= 35
  X = 5
• 10 years agoHelpfull: Yes(0) No(0)
• average of 5 students including the elder one is 7. i.e
  (15+4x)/5 = 7
  By solving this we will get the average age as 5 yrs
• 9 years agoHelpfull: Yes(0) No(0)
• 5
  5*7-4*x=15
  x=5
• 9 years agoHelpfull: Yes(0) No(0)
• average 0f 5 girls=7
  oldest girl age is 15
  5*7=35 oldest=15
  total age of 4 girls 35-15=20
  20/4=5
• 8 years agoHelpfull: Yes(0) No(0)