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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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Parviz F. | Mathematics professor at Community CollegesMathematics professor at Community Colle...
4.8 4.8 (4 lesson ratings) (4)
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 $135 - $15 = 120     / Total spend on T-shirts.
 
  $120/ $30 = 4      / Number of t-shirt bought. 
Vivian L. | Microsoft Word/Excel/Outlook, essay composition, math; I LOVE TO TEACHMicrosoft Word/Excel/Outlook, essay comp...
3.0 3.0 (1 lesson ratings) (1)
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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