How is the sum of 70,0 to be divided among a mother, three males, and two females?

If the mother referred to in the question is the deceased's wife and the mother of the children, then the distribution is as follows:

For the wife: 8,750 Riyals (one-eighth of the total amount). The remaining amount is divided among the children according to the following: For each of the three male children: 15,312.5 Riyals. For each of the two female children: 7,656.25 Riyals.

This division is based on the Almighty's saying: "Allah instructs you concerning your children: for the male, what is equal to the share of two females… until His saying: But if you have children, for them [the wives] is one eighth of what you leave, after any bequest you [may have] made or debt." (An-Nisa:11).