If 5−p = 4−q = 20r, then 1p + 1q + 1r =

1.	If 5−p = 4−q = 20r, then 1p + 1q + 1r =
Answer» If $5^{- p} = 4^{- q} = 20^{r}$ , then $\frac{1}{p} + \frac{1}{q} + \frac{1}{r} =$

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