Asked by emma adams

one fifth of a plank is sawn off and there eights of the remaining peice is then thrown away. What fraction of the original plank remains?
Answered by oobleck
after 1/5 gone, there are 4/5 remaining.
3/8 * 4/5 = 3/10
So, what remains is 1 - 1/5 - 3/10 = ______
Answered by henry2,
1 - 1/5 = 5/5 - 1/5 = 4/5 remains.

4/5 - 3/8 = 32/40 - 15/40 = __ remains.

Answered by henry2,
Correction:
1 - 1/5 = 5/5 - 1/5 = 4/5 remaining.
4/5 - 3/8*4/5 = 4/5 - 12/40 = 32/40 - 12/40 = 20/40 = 1/2 remains.
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