So, we can start off by listing what information the question has given us:
Billboard height - 8 3/8 ft
Scale - 1 ft = 8 in
With this info, we can undergo a conversion. We know 1 foot is eight inches but we have been given 8 feet. Since every one foot is eight inches, we will multiply the 8 feet by 8 inches.
8ft x 8in = 64 in
We have converted the 8 feet but still have the 3/8th of a foot. Since every number is a fraction over 1, we can multiply 3/8ft by 8/1 inches to convert it.
3 8 24
— x — = —
8 1 8
24 over 8 can be simplified into 3 over 1, aka 3 (8 divided by 8 is 1, and 24 divided by 8 is 3).
3 + 64 = 67
The woman’s actual height is 67 inches or 5.58 ft (since every 12 in make a ft).