Znajdz iczbę,której:
a) 20% jest rowne 16
b) 3 i 1/3 % jest równe 120
c) 8,5% jest rowne 0,85
d) 33i 1/3% jest równe 1 i 1/2
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a). 20%·x = 16
1/5x = 16
x = 16/(1/5)
x = 16(5/1)
x = 16·5
x = 80
b).3 1/3% = 10/3%
(10/3)/100·x = 120
10/300x = 120
x = 120·30/1
x = 120·30
x = 3600
c). (85/10)/100·x = 0,85
85/1000x = 0,85
x = 0,85·1000/85
x = 850/85
x = 10
d). (100/3)/100·x = 1,5
100/300x = 1,5
x = 1,5·3/1
x = 1,5·3
x = 4,5