What's my Body Mass Index?
Python, 69 bytes



lambda w,h:["UOnvd"[w/h/h&gt;20::2]+"erweight","Normal"][18.5&lt;=w/h/h&lt;25]


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Compare to 72 bytes:

lambda w,h:"Underweight"*(w/h/h&lt;18.5)or"Normal"*(w/h/h&lt;25)or"Overweight"