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x- 100%
20 - 40%
x = 10 * 100 :40 = 1 000 : 40 = 50
2.
x - 100 %
64 - 40 %
x = 64 * 100 : 40 = 6400 : 40 = 160
Jeżeli 40% liczby a wynosi 20, to a= 50
Jeżeli 40% liczby b wynosi 64, to b= 160
100%-x
x- 50
100%=x
40%-64
x- 160