Пусть х будут деньги Еремы.
х+3+х=7
2х+3=7
2х=10
х=10:2
х=2 Еремы
2+3=5-Фомы
3 3/16=51/16=3,1875 кажется так
1. 1/6 = 3/18, 1/9 = 2/18
1/30 = 5/150, 1/50 = 3/150
1/24 = 5/120, 1/120
3/40 = 15/200, 7/25 = 56/200
2. 30/48 = 5/8 = 35/56 < 36/56
56/84 = 8/12 = 72/108 < 82/108
121/77 = 11/7 = 33/21 < 45/21
49/63 = 7/9 = 35/45; 34/85 = 2/5 = 18/45; 35/45 > 18/45; 49/63 > 34/85
1) 440-360=80(c)
2)80:10=8(c) - за 1 час
3) 440:8= 55(ч)-1
4) 360:8=45(ч)-2