To solve for the variable "w" you only need to use algebra to get it alone on one side of the equals sign.
Add them all around the top pointing down
Use Pythagorean Theorem:
c = sr (a^2 + b^2) = sr (3^2 + 5.3^2)
= sr (9 + 28.09) = sr (37.09)
= 6.09 = 6.1
U cant simplify it, this fraction 11/40 is simplified to the max.