First you divide 1200 by 25 (1200/25) it comes out to 48.
That means the he types at a rate of 48wpm. So then all you have to do is multiply 48 and 45 and you get 2160 words.
Hello!
288 / 24 = 12
6 * 12 = 72
Jan used 72 grams of tea leaves to make tea.
I feel like you just put random numbers in to waste someone time... but I did the problem any way.