
D = sqrt(str)+ sqrt(str)+ sqrt(str)+ sqrt(str) + 20 - soak <--equation for ram
X = sqrt(str)+ sqrt(str)+ sqrt(str)+ sqrt(str) <-- X = the combined str of all the players
D = x + 20 - soak
1 = x + 20 - 70
We need to do at least one damage to the wall per hit to effect the wall, so damage is set to 1.
1 = x -50
x = 51
Now we can insert X into the second equation.
51 = sqrt(str)+ sqrt(str)+ sqrt(str)+ sqrt(str)
51^2 = str + str + str + str
2601 = the combined str needed to damage a brick wall.
See now that wasn't so hard, right?