Boats 2

Three quarters of the boats in the marina are white 4/7 of the remaining boats are blue, rest are red if there are 9 red boats. How many boats are in the marina?

Correct answer:

n =  84

Step-by-step explanation:

$$\begin{gathered} 3\mathrm{/}4\cdot n+4\mathrm{/}7\cdot (n-3\mathrm{/}4\cdot n)+9=n \\ 3n=252 \\ n=84 \end{gathered}$$

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