100%=5кг
х%=4,5кг
100%/х%=5кг/4,6кг
100*4,6=5*х
460=5х
х=460:5
х=92%-продукта
100%-92%=8%-отходов
1. = 1 7/12:(9/24+10/24) = 1 7/12:19/24 = 19/12*24/19 = 2
2. =17/36: ( 21/36-20/36 ) = 17/36:1/36 = 17/36*36/1 = 17
3. = ( 3/14+10/14):26/7 = 13/14:26/7 = 13/14*7/26 = 1/4
4. = 19/24:(9/48+10/48) = 19/24:19/48 = 19/24*48/19 = 2
( 11 ч 22 мин + 38 мин) :3= (682 мин + 38 мин) : 3=240 мин
11ч 22 мин= 682 мин
( 96 ч - 2 сут. ) : 2= ( 4 сут - 2 сут.) : 2=1 сут.
96 ч =4 сут.
15 мин + 2 ч. - 95 с= 900 с+ 7 200с - 95с=8 005 с.
15 мин =900 с,
2 ч =7 200 с
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