Question

A).12% razy x =6
b).y-14%y=40,42
c).10% a+a = 143
d).x+110%x=23,1

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Answer 1

A).12% razy x =6
12% = 12/100 [dwanascie setnych]
12/100 x = 6
x = 6*100/12 = 50
b).y-14%y=40,42
y - 14/100 y = 40,42
100/100y - 14/100 y = 40 i 42/100
86/100 y = 4042/100
y = 4042/100 * 100/86 = 47
c).10% a+a = 143
10/100a + a = 143
110/100 a = 143
a = 143 * 100/110 = 130
d).x+110%x=23,1
x + 110/100x = 231/10
210/100 x = 231/10
x = 231/100 * 100/210 = 1,1

Answer 2

PROCENTY TO CZĘŚCI SETNE
1%=1/100

a).12% razy x =6
12%=12/100
(12/100)*x=6 /*100
12x=600 /:12
x=5

b).y-14%y=40,42
14%=14/100
y-(14/100)y=40,42 /*100
100y-14y=4042
86y=4042 /:86
y=47

c).10% a+a = 143
10%=10/100=1/10
(1/10)a+a=143 /*10
a+10a=1430
11a=1430 /:11
a=130

d).x+110%x=23,1
110%=110/100=11/10=1,1
x+1,1x=23,1 /*10
10x+11x=231
21x=231 /:21
x=11