12,4 * 3/5 = 2/7х
12,4 * 0,6 = 2/7х
7,44=2/7х
7целых11/25 = 2/7х
х=186/25:2/7 = 186/25 * 7/2 = 651/25 = 26,04
Искомое число: 26,04
Проверка:
12,4*0,6 = 2/7 * 26,04
7,44 = 7,44
1 кг. колбасы-Х
1 кг.сыра -Х-16
10 кг. колбасы -10Х
7 кг - сыра- 7(Х-16)
10Х-7(Х-16)=472
10Х-7Х+112=472
3Х=472-112
3Х=360
Х=120 руб. 1 кг.колбасы
120-16=114 1 кг. сыра
120*10+114*7=1200+798=1998
1) 1 - 1/2 = 1/2 - остаток
2) 1/2*1/2=1/4 - вылили второй раз
3) 1/2 - 1/4 = 2/4 -1/4 = 1/4 - остаток
4) 1/2 *1/4 = 1/8 - вылили третий раз
5) 1/2+1/4+1/8 = 4/8+2/8+1/8 = 7/8 - вылили всего
Ответ: 7/8 воды вылили всего.
Two girls-artist, Sue Jones, rent a room, under the window which is a huge tree. One of the girls was seriously ill, she desperately does not want to fight, come up with myself that as soon as the last autumn leaf fall from the tree outside the window, she dies, and is quietly waiting for death. A sheet of all falls, falls, falls ... It turns out the last leaf has fallen for a long time, as it should have happened, and the neighbor-artist, Berman old, not very talented, but very good, painted the exact same sheet in the picture , cold and died. His first and last masterpiece rescued the girl, because she suddenly went on the mend