Grant F. answered 10/08/14
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Since the problem states that Ryan's amount of golf balls is "15 more than 1/3 of the total" performing the opposite operations on Ryan's amount, 75, will give us the overall total.
"15 more than" means that the previous product then had 15 added to it, so we will work backwards by subtracting 15 before we multiply.
"1/3 of total" means the total was divided by 3, so we will multiply by 3 to work backwards.