The average age of five persons is 40 years while the average age of some other 10 persons is 25 years. The average age of all the 15 persons is:

a) 27 Years
b) 32 Years
c) 37 Years
d) 30 Years
e) 35 Years

• d) 30
  x/5==40
  x==200
  after 10 person
  x/10==25
  x==250
  so avg btwn 15 person is,,
  (250+200) / 15==30 ans
• 8 years agoHelpfull: Yes(17) No(0)
• No. Avg. Sum
  5 40 5*40=200
  10 25 25*10=250
  15 ? =(450/15)=30
• 8 years agoHelpfull: Yes(3) No(0)
• A=sum of five persons
  B=sum of 10 persons
  A/5=40---->A=200
  B/10=25--->B=250
  (200+250)/15=30
  
• 8 years agoHelpfull: Yes(1) No(0)