Total number 30,average of first 10 number is equal to average of last 20 digits ,then find out last 20 digits sum ?

• Let x be sum of first 10 numbers. and y be sum of last 20 numbers.
  Now,
  x/10 = y/20
  Therefore, 20x = 10 y
  Hence, 2* sum of first 1o numbers is equal to sum of last 20 numbers.
• 9 years agoHelpfull: Yes(13) No(0)
• Let average of first 10 numbers is a. Then sum = 10a
  Average of last 10 nmbers also a. Then their sum = 20a
  so sum of last 20 =2 * sum of 1st 10
• 9 years agoHelpfull: Yes(1) No(0)
• (1+2+3+......+10)/10=(1+2+3+...+20)/20
  2(1+2+3+....+10)=(1+2+3+....+20)
• 9 years agoHelpfull: Yes(0) No(0)
• total number=30
  first 10 numbers= last 20 numbers
  20 number(last)=2*sum of 10 numbers
  
• 9 years agoHelpfull: Yes(0) No(1)
• (1+2+….+10)/10 = (11+12+……+30)/20
  20(1+2+……..+10)/10 =(11+12+13+………+30)
  2*sum(1+2+……..+10) = sum (11 to 30)
  
• 8 years agoHelpfull: Yes(0) No(0)