A shelf is 24 inches wide. How many books, each StartFraction 7 Over 8 EndFraction of an inch thick, can fit on the shelf?

Which equation can be used to solve the above problem?
24 divided by StartFraction 7 Over 8 EndFraction
StartFraction 7 Over 8 EndFraction divided by 24 = b
b divided by 24 = StartFraction 7 Over 8 EndFraction
b divided by StartFraction 7 Over 8 EndFraction = 24