7 people average age is 30. youngest person age is 7. find average of the people when youngest was born.

• Read question carefully .we have to find the average when youngest was born so we wont include youngest person.so we have to calculate average age of remaining 6 people.
  30*7=210
  210-49=161
  avg=161/6=26.8
• 8 years agoHelpfull: Yes(45) No(9)
• average age of people =30
  so have total age =210
  before 7 years we have to deduct each person age by seven years 210-49=161
  so average age would be 161/7=23 ans
• 8 years agoHelpfull: Yes(43) No(12)
• clearly u have to go 7 year back,
  so 30-7=23
  ans is 23
• 8 years agoHelpfull: Yes(17) No(17)
• age of 7 people: 7*30=210 years
  age of 6 people(except younger one): 210-7=203
  avg age of 6 people in PRESENT(except younger one) = 203/6 =33.83
  avg age of people when younger was born = 33.83-7=26.83
• 8 years agoHelpfull: Yes(6) No(11)
• Avg of 7 people is=30
  30*7=210
  210-7=203
  Youngest was born before 7 seven years then avg is
  210-(7*7)/7=161/7=23
  Ans is 23.
• 8 years agoHelpfull: Yes(5) No(0)
• Total age is 30x7=210
  Youngest one is 7. So the remaining is 203.
  Before 7 year sum of age is 203-(6*7)=161
  so the average age is 161/6= 25.83
• 8 years agoHelpfull: Yes(4) No(2)
• Average age (present) of 7 members = 30 years
  7 years ago, average age of 7 members was 30 - 7 = 23 years.
  Since, the youngest member was not born 7 years ago.
  Therefore, Average age of remaining 6 members is increased by 23/6 = 3.8 years.
  Therefore, 7 years ago, average age of 6 members was 23 + 3.8 = 26.8 years.
• 8 years agoHelpfull: Yes(2) No(1)
• age of 7 people: 7*30=210 years
  age of 6 people(except younger one): 210-7=203
  avg age of 6 people(except younger one) = 203/6 =33.83
• 8 years agoHelpfull: Yes(1) No(10)
• (x+y+z+a+7)/5=30
  x+y+z+a=143
  
  now {(x-7)+(y-7)+(z-7)+(z-7)}/5=avg
  {x+y+z+a-28}/5=avg
  {143-28}/5=avg
  avg=23
• 8 years agoHelpfull: Yes(1) No(0)
• Ans = 28
  Recent age avg = 7*30 = 210
  7 years before = 7(years)*6(persons) = 42
  210-42 = 168
  Avg age = 168÷6 = 28
• 7 years agoHelpfull: Yes(1) No(2)