#4
200-25=175( кг)-осталось
200-100%
175-x
200x=175*100
200x=17500:200
x=87,5=88
#5
0,125
#6
0,075
#7
160-100%
110-x
160x=110*100
160x=11000:160
x=68,75=69
#8
90-100%
300-x
90x=300*100
90x=30000:90
x=333
#10
180-100%
290-x
180x=290*100
180x=29000:180
x=161
#11
220*10-(220*10)*0,05))=2200-110=2090
#12
0,1
#13
2%
#14
15-100%
x-20%
15*20=100x
-100x=-300:(-100)
x=3
#15
85-17%
x-100%
8500=17x
-17x=-8500:(-17)
x=500