Greg and Bill

Greg is 18 years old. He is 6 less than 4 times Bill's age. How old is Bill?

Correct answer:

b =  6

Step-by-step explanation:

$$\begin{gathered} g=18 \\ g=4b-6 \\ b=(g+6)\mathrm{/}4=(18+6)\mathrm{/}4=6 \end{gathered}$$

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