*edit
Answer:
4/5
Explanation:
you'd do 4 divided by 2 which is 2, then you'd do 10 divided by 2 which is 5. so you get 4/5.
What is 4/10 * 2?
4/10 * 2/1 = 8/10.
8/10 can then be simplified into 4/5.
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