They tell you that the average (16+12+X)/3 is between 19 and 25 inclusive, so we write it like that with x the number of starfish Carey bought:
19<= (28+x)/3 <= 25
They ask you the biggest difference which is possible between the numbers of starfish Carey bought.
The smallest value Carey bought is 19=(28+x)/3
The highest value Carey bought is 25=(28+x)/3
It gives you x=29 and x=47
And the result is 47-29=18
Did you guess for your answer 22?
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