The answer is 4/5, you can draw a model and compare and see or the easiest way is to write the fraction like this. And multiply cross way, 3 x 4 = 12 and 5 x 2 = 10, so write 12 on top of 4/5 and 10 on top of 2/5. So as you can tell, 4/5 is bigger than 2/3. Sorry for long explanation, it would be easier if I talked to you.
2 4
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3 5
