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James belongs to a club. he pays $15 to join. James purchases tee-shirts for $30. If James total bill is $135, how many t-shirts did James buy?

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2 Answers

Hi Anna;
x=quantity of t-shirts
Let's subtract $15 from both sides...
Let's divide both sides by $30...
Note that the units of $ are in each numerator and denominator.  Henceforth, these cancel.