Charges per load = $5.25
Total money = $31.50
As the situation says that charges are 5.25 and one has a total money of 31.50 so lets suppose the total load one has be 'w'
so equation becomes:
[tex]5.25w\leq31.50[/tex]
solving it we get, [tex]w\leq6[/tex]
So, option C is the correct answer.