How is an inheritance distributed among a wife, a full sister, and two brothers, when the deceased has debts?

If the deceased owed a debt, it must be paid off first before the inheritance is distributed among the heirs, based on the Almighty's saying: "after any bequest he [may have] made or debt." After the debt is settled, the remainder is divided among the heirs. The wife receives one-fourth due to the absence of direct descendants, and the remainder goes to the two full brothers and the full sister by asabah (agnatic succession), with the male receiving the share of two females. The inheritance is divided into twenty shares: the wife receives five shares, each full brother receives six shares, and the full sister receives three shares.