Question

the sum of three consecutive odd numbers is 129? what is the smallest of the three number?

Answer 1

(2k + 1 ) + ( 2k + 3) + ( 2k + 5 ) = 129 ;
6k + 9 = 129 ;
6k = 120 ;
k = 20 ;
2 * 20 + 1 = 41 is the smallest of three consecutive odd numbers ;