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?

Question

Solve and check equation to determine how many tee-shirts James bought. I need a specific answer.please please help

Answer 1

I would establish the following variables:

 

j = amount paid to join

x = # of t-shirts purchased

t = total amount paid

 

Then we have this formula for total paid:

 

t = j + 30x

 

We know the value of j and t:

 

135 = 15 + 30x

 

Subtracting 15 from both sides:

 

120 = 30x

 

Then, dividing both sides by 30:

 

4 = x

 

James paid $15 to join, and $30 each for 4 t-shirts ($120), for a total of $135.

Answer 2

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