Blue-eyed inhabitant calculation

480 people live in the village of Grandmother. There are seven times fewer blue-eyed people than people with different eye colors. How many inhabitants of the village are blue-eyed?

Final Answer:

m =  60

Step-by-step explanation:

$$\begin{gathered} m=x/7 \\ m+x=480 \\ 7m-x=0 \\ Row2-\frac{1}{7}\cdot Row1\to Row2 \\ 1.14x=480 \\ x=\frac{480}{1.14285714}=420 \\ m=\frac{0+x}{7}=\frac{0+420}{7}=60 \\ m=60 \\ x=420 \end{gathered}$$

Try another example