THE WIDOW'S LEGACY.

A gentleman who recently died left the sum of $80,000 to be divided among
His widow, five sons, and four daughters. He directed that every son
Should receive three times as much as a daughter, and that every
Daughter should have twice as much as their mother. What was the widow's
Share?

Mother's money = M
Daughter's money = D = 2M
Son's money = S = 3D = 6M

now there are 5 sons, 4 daughters and one mother so:

80000 = M + 4D + 5S

I trust you can take it from here?