Aparent died and left an estate to four children. one inherited one fifth of the estate, the second inherited three tenths, and the third inherited three tenths. how much did the fourth inherit?

Hi!

First, add all the fractions.

1 3 3 ?
-- + -- + --- = ---
5 10 10 ?

1/5 = 2/10

2 3 3 8
-- + -- + --- = ---
10 10 10 10

Now subtract.

10 8 2
--- - --- = --
10 10 10

2/10 = 1/5

The fourth inherited 1/5.

Hope this helps!
-Peredhel

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