Please help me find c1 and c2. Thanks

I 2. A 2m bar can pivot around its center. A 20M weight is applied to the right end of the bar. (a) if another weight of 37M will be applied on the left side of the bar, where should it be placed? lb) if another weight is placed on the middle of the left side of the bar, what is the mass of that object? (o) If another weight of 15M is applied to the other end, where should the pivot point he in reference to the (:1) 20N weight and (c2) 15M weight for it toremain balanced