
Arturo O. answered 03/06/18
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a = total amount of homework to be done
On Wed, he did a/3. That leaves (1 - 1/3)a = 2a/3 to be done. He did half of that on Th, which is
(1/2)(2a/3) = a/3,
so he did 1/3 of the total homework on Th.