How does the MO equivalent in titanium alloy calculated?

The formula is MOE \u003d 1.0 (wt.% Mo) + 0.67 (wt.% V) + 0.44 (wt.% W)
+0.28 (wt.% Nb) + 0.22 (wt.% Ta) + 2.9 (wt WT.% Fe)
+1.6 (wt.% Cr) + 1.25 (wt.% Ni) + 1.70 (wt.% Mn)
+1.70 (wt.% Co)? 1.0 (wt.% Al)
For example, Ti-5AL-2SN-2CR-4 MO-4ZR-1FE (wt. %) Alloy, how to calculate the amount of MO, help