We are given
Mr. Lee can paint 20 chairs in t hours
so,
[tex]20 chairs=t hours[/tex]
now, we can find for 1 chair
so, we can divide both sides by 20
[tex]1 chair=\frac{t}{20} hours[/tex]
now, we can multiply both sides by 7
[tex]7*1 chair=7*\frac{t}{20} hours[/tex]
[tex]7chairs=\frac{7t}{20} hours[/tex]....................Answer
