Răspuns:
Explicație pas cu pas:
7/10 = 21/30
14/15 = 28/30
21/30 < 22/30; 25/30; 27/30 < 28/30
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9/14 = 18/28
18/28 < 20/28; 21/28; 23/28 < 25/28
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4/5 = 8/10 = 16/20 = 32/40
7/10 = 14/20 = 28/40
28/40 < 29/40; 30/40; 31/40 < 32/40
