Problem #3
Clue 1: I am less than 100 - one or two digit number
Clue 2: the sum of my digits is 4 - must be 4, 13, 22, 31, or 40
Clue 3 half of me is a odd number - 1/2 of 4=2 (even), 1/2 of 13 and 31 are not whole numbers, 1/2 of 22 is 11 (odd), 1/2 of 40=20 (even)
Answer: 22
Problem 4
Clue 1: Double my tens digit to get my ones digit - number >=10
Clue 2: Double me and I am less than 50. Since 2*25 = 50, the number must be <=24 but >=10
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Of this group, only 12 and 24 have a ones digit that's twice the tens digit
Answer: Either 12 or 24. We need another clue to decide which it is.
