Question 958227
Each number must begin with a 5 or 6.
Consider possible numbers beginning with 5.
second digit 6
561
563
565

second digit 3
531
535
536 not odd

second digit 1
513
516 not odd

So there are 6 numbers that qualify and start with 5

Consider possible numbers beginning with 6.
second digit 5
651
653

second digit 3
631
635
636 not odd

second digit 1
613
615 

There are 6 numbers that qualify.

This gives a total of 12 numbers that qualify