Question

one fifth of a plank is swan off and three eighths of the remaining piece is then thrown away. what fraction of the original plank remains​

Answer 1

Answer:

17/40

Step-by-step explanation:

Let the total length of the plank be x

1/5 of the plank means 1/5*x=x/5

Remaining is= x-x/5=4x/5

Then 3/8 of the plank means 3/8*x=3x/8

Remaining is=4x/5-3x/8=17x/40

i.e is 17/40 of x or the original plank

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