3/5 of an hour (0.6 hours)
First, find how many words Nick types in an hour by multiplying 275 * 60.
Nick types 16,500 words per hour.
Now just divide 9,900 by 16,500.
It takes Nick 3/5 of an hour to type 9,900 words. (0.6 hours)
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Answer:
Number of years between 1950 and 2100 =

150 = 50 + 50 + 50 years.

So, total population in 2100 is 375,000,000.
3:80
4:20 those are the answers
1/3 of 9/5 is 3/5
1/3*9/5 = 9/15 = 3/5
Hope this helps!