Which representation is correct for the rolling shear constant?

a$)$ lb$/$Q

b$)\frac{Q}{\text{I}}b$

c$)$bQ$/$I

d$)$ Ibw$/$Q

Given the following, calculate the load on each shore $($in pounds$)$

Joist spacing: $32"$ Stringer spacing: $28"$ Shore spacing: $48"$ Design Load: $240$ psf