Verified Answer :

1h = 60m 

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7/8w=(1+1/6)h

7/8w=(6/6+1/6)h

7/8w=7/660m

7/8w=(7
610m)/6

7/8w=70m

m=(7/8w)/70

m=1/80w

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In 1 minute Melinda paints 1/80 of the wall.

For this case we can make the following rule of three:

\(\frac{7}{8}\) of a wall ---------------> \(1 \frac{1}{6}\) hours

x ------------------------------> \(\frac{1}{60}\)

Note: we have the following conversion:

1 hour = 60 minutes

From here, we must clear the value of x we have then:

\(x = \frac{\frac{1}{60}}{1\frac{1}{6}}*\frac{7}{8}\)

Rewriting we have:

\(x = \frac{\frac{1}{60}}{\frac{7}{6}}*\frac{7}{8}\)

\(x = \frac{6}{420}*\frac{7}{8}\)

\(x=\frac{42}{3360}\)

\(x=\frac{1}{80}\)

Answer:

A part of a wall that Melinda paints in 1 minute is:

\(x=\frac{1}{80}\)