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Answer:
a. fraction of the cake each Marian, Mark, and Mariel will get
b. 1/2 of the cake is to be shared, 3 children, and 1/5 of the cake taken by Mariel
c. multiplication and division
d.
(1/5)(1/2) ---> Mariel
so, 4/5 of 1/2 of the cake is remaining
(2/5)(1/2) ---> Marian
(2/5)(1/2) ---> Mark
e.
Mariel = 1/10 of the cake
Marian = 2/10 (or 1/5) of the cake
Mark = 2/10 (or 1/5) of the cake
Check: 1/10 + 2/10 + 2/10 = 1/2 of the cake