Part A). If 100 fish all had the same weight, and they weighed 235 pounds when they were all on the scale at the same time, then each fish weighed
235 / 100 pounds .
Part-B). You can find that actual weight with your calculator.
235 / 100 = 2.35 pounds .
Part-C). If there were only 10 fish but their total weight was still 235 pounds, then each fish would have to weigh a lot more, to make up the same weight with only 10 of them.
Now, each fish would have to weigh 235 / 10 pounds .
That number is 235/10 = 23.5 pounds.
If there were only 1/10 as many fish, then in order to add up to the same total weight, each fish would have to be 10 times as heavy.
