Question

1.zadanie
x+15=70
85=2*x
x trzecich = 12
x+5=2*(x+1)
2.zadanie
12%x=6
100%a+10%a=143
100%y-14%y=40,42
100%x+110%x=23,1

Answer 1

X+15=70
x=70-15
x=55

85=2*x/:2
x=42 i 1/2

x trzecich = 12 /*3
x=36

x+5=2*(x+1)
x+5=2x+2
x-2x=2-5
-x=-3/ * -1
x=3

2.zadanie

12%x=6
100% = x
x= 100*6 / 12
x= 600/12
x=50

100%a+10%a=143
110% - 143
100% - a
a= 100*143 / 110
a= 14300/110
a=130

100%y-14%y=40,42
86% - 40,42
100% - y
y= 100*40,42 / 86
y= 4020/86
y=46,74

100%x+110%x=23,1

210% = 23,1
100%=x
x= 100*23,1/210
x=2310/210
x=11

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