Coffee

Coffee from the machine in the cup cost 28 cents. Coffee is 20 cents more expensive than the cup.

How much is the cup?

Correct answer:

x =  4 cent

Step-by-step explanation:

$$\begin{gathered} (20+x)+x=28 \\ 20+2x=28 \\ x=(28-20)\mathrm{/}2 \\ x=4\text{ cent} \end{gathered}$$

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