On a blueprint in which 2 inches represent 5 feet, the length of a room mesure 7 1/2 inches. The actual length of the room is?

Answer 1

2 inces = 5 ft
7.5 inches = x feet

x= (5*7.5)/2
x =

Answer 2

How do you get that equation and why do u divide it by 2?

Answer 3

Linda set up a simple ratio

2/5 = 7.5/x
she then cross-multiplied
2x = 5(7.5)
and finally divided both sides by 2

x = 5(7.5)/2 = 18.75 ft

or

if 2 inches represent 5 ft
then 1 inch represents 5/2 ft
then 7.5 inches represents (5/2)(7.5)
which is the same calculation as above