$135 - $15 = 120 / Total spend on T-shirts.

$120/ $30 = 4 / Number of t-shirt bought.

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Woodland Hills, CA

$135 - $15 = 120 / Total spend on T-shirts.

$120/ $30 = 4 / Number of t-shirt bought.

Middletown, CT

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

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