Question

A store is selling cookies for $8 for 12 bags how much will it cost if you want to buy 30 for your class?

Answer 1

Answer: $20

Step-by-step explanation:

8 divided by 12 = .67

.67 times 30

Answer 2

$\bf \begin{array}{ccll} \ &bags\\ \cline{1-2} 8&12\\ x&30 \end{array}\implies \cfrac{8}{x}=\cfrac{12}{30}\implies \cfrac{8}{x}=\cfrac{2}{5}\implies 40=2x\implies \cfrac{40}{2}=x\implies 20=x$