3/10 = 6/20
4/5 = 16/20
30/40 = 15/20
2/5 = 8/20
3/4 = 15/20
40/60 = не получится, поскольку 40 не делится на 3
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3/10 = 6/20
4/5 = 16/20
30/40 = 15/20
2/5 = 8/20
3/4 = 15/20
40/60 = не получится, поскольку 40 не делится на 3