LCM(5,7) = 35
2/5 = 2x7/(5x7) = 14/35 = 28/70
2/7 = 2x5/(7x5) = 10/35 = 20/70
21/70, 22/70 , 23/70, 24//70, 25/70 are five rational number between 2/5 and 2/7.
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