1,32 : 3 1/7 = 1,4у : 5/6
1 32/100 : 22/7 = 1,4у : 5/6
132/100 : 22/7 = 1,4у : 5/6
132/100 * 7/22 = 1,4у : 5/6
132*7/100*22 = 1,4у : 5/6
924/2200 = 1,4у : 5/6
1,4у = 5/6 * 924/2200
1,4у = 5*924/6*2200
1,4у = 4620/13200
1,4у = 231/660
у = 231/660 : 1,4
у = 231/660 : 1 4/10
у = 231/660 : 14/10
у = 231/660 * 10/14
у = 231*10/660*14
у = 2310/9240
у = 231/924
у = 1/4 или 0,25
<u>проверка:</u>
1,32 : 3 1/7 = 1,4 * 0,25 : 5/6
1 32/100 : 22/7 = 0,35 : 5/6
132/100 * 7/22 = 35/100 * 6/5
132*7/100*22 = 35*6/100*5
924/2200 = 210/500
231/550 = 210/500
231*500/550*500 = 210*550/500*550
115.500/275.000 = 115.500/275.000
0,42 = 0,42
1 пара это 30: 18/30 и 5/30. 2 пара 44 20/44 и 33/44, 3 пара 42 7/42 и 6/42
0.5*(x+3)=0.8*(10-x)
0.5x+1.5=8-0.8x
0.5x+0.8x=8-1.5
1.3x=6.5
x=6.5:1.3
x=5
Ответ:5