There are exactly 1.5 inches in one and one half inches.
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100000 inches . * * * * * What? The answer depends on "one and one half" of what. But whatever that is, the answer is not likely to be 100000 inches!
Eighteen inches.
One yard and a half = 1.5 x 36 inches = 54 inches.
42 inches
2 and one half feet = 30 inches