Two because if there was seven and i take five it gives you two
He typed faster the second time because if you multiple 60 minutes by 1/10 and 1/12 of and hour separately, you get a smaller answer with 1/12 than by 1/10, and thereby a smaller answer.
Hope this helps!
10/10 = 1
There is no decimal form unless you do 1.0, 1.00, 1.000, and so on.
Divided 75000 by 10000 so it would be 7.5 square cm