Ответы:
42/24 = 7/4 и 35/77 = 5/11 и 48/60 = 4/5 и 72/96 = 3/4
56/70 = 4/5 и 72/90 = 4/5 и 60/105 = 4/7 и 45/150 = 3/10
84/120 = 7/10 и 96/100 = 24/25