Any body know how to start this problem?

At the Skywalker moisture farm on the desert planet Tatooine, there are 24 moisture

processors, with an average yield per processor of 300 cubits of moisture. Research conducted

at Mos Eisley University concludes that when an additional processor is used, the average

yield per processor is reduced by 5 cubits. Help Owen and Beru Skywalker ﬁnd the number of

moisture processors that will maximize the number of cubits.