PLIS POMUŻCIE MI TO ZROBIC
zad1
a)30% pewnej liczby to 45.jaka to liczba?
30%to-45
10%to-
100%to-
b)90%pewnej liczby to 279.jaka to liczba?
90%to-270
10%to-
100%to-
c)60%pewnej liczby to 400.jaka to liczba?
60%to-400
10%to-
100%to-
dam naj
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a)
30 % - 45
100 % - x
x = (100 x 45) : 30 = 4500 : 30 = 150
10 % = 0,1 x 150 = 15
b)
90% - 279
100 % - x
x = (100 x 279) : 90 = 27900 : 90 = 310
10 % = 0.1 x 310 = 31
c)
60 % - 400
100 % - x
x = (100 x 400) : 60 = 40000 : 60 = 666 i 2/3
10 % = 0.1 x 666 i 2/3 = 66 i 2/3