If average of 2 number is ab. and 1st number is a. Find the second number ?

• Let the two number be x and y. Sum of two number is x+y=2ab . given x=a.
  therefore, a+y=2ab => y=2ab-a => y=a(2b-1)
  
  second number is a(2b-1).
• 10 years agoHelpfull: Yes(2) No(0)
• Once we know the average of the numbers and the number of the items, we can use them to find the sum of the numbers. In this case there are two terms and the average is given as ab. The sum of the numbers should be the product of these two values, so it is 2ab. One of the numbers is a, the other number can be obtained by subtracting this number from the sum of the two numbers, which is 2ab.
  The second number is (2ab –a)
  This will be the answer if they did not mention the second number as b. If they mention the second number as b, then all the answer choices will be in terms of a. Then, we can solve in the following manner
  Second number = b = 2ab –a
  2ab–b =a
  b(2a –1) = a
  b = a/(2a–1)
  
  a/(2a–1) is the answer
  
• 10 years agoHelpfull: Yes(1) No(0)
• let the second number is x then
  average of two number is ab and in which first number is given a
  so (a+x)/2=ab
  x=2ab-a
  x=a(2b-1) ans
• 10 years agoHelpfull: Yes(1) No(0)
• (a+b)/2=ab
  =a+b=2ab
  b=>a(2b-1)
• 9 years agoHelpfull: Yes(0) No(0)
• Avg= Sum/Total numer
  Given,
  ab=sum/2
  sum=2ab
  SInce, 1st number is given
  a+x=2ab
  x=a(2b-1)
• 9 years agoHelpfull: Yes(0) No(0)
• As we know that avg of no=Addition Of all no/Total No.
  so
  here it is given 2nd no. is b
  so (a+b)/2=ab
  =>a+b=2ab
  =>a=2ab-b
  so a=b(2a-1)
• 8 years agoHelpfull: Yes(0) No(0)