To determine how many words Tatyana can text in 12 minutes, we first calculate her typing rate.
Tatyana texts 225 words in 5 minutes. Therefore, her rate is:
\[ \frac{225 \text{ words}}{5 \text{ minutes}} = 45 \text{ words per minute} \]
Now, we can find out how many words she can text in 12 minutes:
\[ 45 \text{ words/minute} \times 12 \text{ minutes} = 540 \text{ words} \]
Thus, Tatyana can text 540 words in 12 minutes.