Question 1119311
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Read the lesson

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/coordinate/lessons/The-Robinson-family-and-the-Sanders-family-each-used-their-sprinklers-last-summer.lesson>The Robinson family and the Sanders family each used their sprinklers last summer</A>

in this site, where the similar problem was solved.


It is your sample.  Read it attentively.


Then substitute your data and get the solution.



It was solved in this forum ~ 10 - 20 times.


If you GOOGLE with the keyword "family each used their sprinklers algebra.com" you will find other numerous solutions in the archive.