9/ 20=9:20=0,45
7/40=7:40=0,175
11/400=11:400=0,0275
21/168=21:168=0,125
35/280=35:280=0,125
47/376=47:376=0,125
10'5 часов,,,,,,,,,,,,,,,,,,,,,
Ответ:
8/12=4/6; 16/32=8/16; 4/6=2/3; 24/76=12/38; 2/22=1/11; 10/16=5/8; 12/28=6/14; 92/256=46/128; 20/38=10/19; 36/82=18/41; 6/66=3/33;