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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

 $135 - $15 = 120     / Total spend on T-shirts.
 
  $120/ $30 = 4      / Number of t-shirt bought. 
Hi Anna;
x=quantity of t-shirts
$15+$30x=$135
Let's subtract $15 from both sides...
-$15+$15+$30x=$135-$15
$30x=$120
Let's divide both sides by $30...
($30x)/$30=$120/$30
Note that the units of $ are in each numerator and denominator.  Henceforth, these cancel.
(30x)/30=120/30
x=4