If $2^{r}=16$ and $5^{s}=25$, what is the value of $r+s$ ?
Since $2 \cdot 2 \cdot 2 \cdot 2=16$, then $2^{4}=16$ and so $r=4$.

Since $5 \cdot 5=25$, then $5^{2}=25$ and so $s=2$.

Therefore, $r+s=4+2=6$.

ANSWER: 6

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