An integer is defined as upright if the sum of its first two digits equals its third digit. For example, 145 is an upright integer since 1 + 4 = 5. How many positive three-digit integers are upright?
OR
Man Wrinkle
Man Wrinkle spent one-fourth of his life as a boy, one-eighth as a youth, and one-half as an active man. If man wrinkle spent 12 years as an old man, then how many years did he spend as an active man?
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