The sum of three numbers is 26. the second number is twice the first and the third number is 6 more than the second. find the numbers.the sum othe sum of three numbers is 26. the second number is twice the first and the third number is 6 more than the second. find the numbers.f three numbers is 26. the second number is twice the first and the third number is 6 more than the second. find the numbers.