These Three want to share 2 Apples equally,
How u handle this with using only one stroke of the knife

First apple: Cut it vertically and equally into two pieces and that's for two people

Second apple: Cut it the same way as above of which a piece is for the third person.

Then the second piece of the second apple should also be cut vertically by making sure it is of equal sizes into three pieces, then they take it each.

They said with one stroke of the knife

Nehyooh:
First apple: Cut it vertically and equally into two pieces and that's for two people

Second apple: Cut it the same way as above of which a piece is for the third person.

Then the second piece of the second apple should also be cut vertically by making sure it is of equal sizes into three pieces, then they take it each.

Wahala

Kill one of you with one stroke of the knife
Lobatan

Put both apples horizontally while holding them from the top which will be on your left and the bottom on your right. With one stroke, measure one third size and cut both from the bottom. Be sure the cut off from the bottom when put together measures to the size of each of the other two (now almost half) apples. There you have it.

Line up the apples. With one stroke cutting the two apple's for three people equally, you'd cut the two apples in the ratio of 1:2 at once which is possible by lining arrangements .

Now you have 2 of 1:2 . 1+1 =2 which will be given to the first person . While the bigger part of the two apples( ratio 2) are given to the remaining two people.