Iam less than 100. The sum of my digits is 4. Half of me is an odd number(.2). if you multiply me by 6,1 end in 8. if you multiply me by 4,1 end in 2(.3).Double my tens digits to get my ones and iam less than 50(.4)i am greater than 15 and less than 40. if you double me, i become a number that ends in 0.one fifth of me is equal to5.(5) i am greater than 30 and less than 40. The sum of my digits is less than 5.