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 result:

x =  4 cent

Solution:

(20+x)+x=28 20+2x=28  x=(28−20)/2 x=4 cent(20+x)+x = 28 \ \\ 20 + 2x = 28 \ \\ \ \\ x = (28-20)/2 \ \\ x = 4 \ \text{cent}

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