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Chiara pays $21 for 3 DVDs that she finds in a one-price bin. Gunther wants to know how much he would spend for 1 DVD in this bin. Chiara wants to know how many dollars she will need to purchase 9 DVDs the next time she goes.

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Gunther would spend $7 for 1 DVD. Chiara would need $63 for 9 DVD's
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To figure out what one DVD would cost, we take our information "$21 for 3 DVD's." All you have to do here is do $21 divided by 3 DVD's to find that one DVD is $7.

If Chiara wants to purchase 9 DVD's next time and needs to know the money, we take our previous information (1 DVD = $7) and input it into this equation.

x (unknown dollars) = 9 (DVD) * 7 ($).

Meaning that 9 * 7 = 63.

It will cost $63 for 9 DVD's, when 1 DVD is $7.

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