What is the math equation to find the scaled version if 1"=2' for Bed dimentions 6'3"L X 3'2"W

first of all: 6'3" = 6 1/4 feet = 25/4 feet

now set up a ratio
1"/2' = x"/(25/4)'
cross multiply (the units are the same, so we can drop them)
2x = 25/4
x = 25/8

so the scale for the length is 25/8 " or 3 1/8 inches

now do the same for the width