Type 32 more words per minute after meals than before meals, 640÷32=20 minutes,

So the 20-minute speed between the first 25 minutes and the last 25 minutes is different.

So I ate it in the 30 th minute. Because I went to eat in the middle of the article,

So as many words are typed in the first 30 minutes as in the last 20 minutes.

The last 20 minutes are 32×20=640 words more than the previous 20 minutes.

These 640 words were typed again 10 minutes before meals.

So the typing speed before meals is 640÷ 10=64 words/minute.

Then type 64×30= 1920 words before meals, which is half of all.

So the full text *** 1920×2=3840 words.