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a) 25[%] x = 42.
25[%] / 100[%] = 0,25.
0,25x = 42 II 0,25;
x = 168.
b) 210*x = 63 II 230;
x = 63 / 210 ;
x = 0,3.
0,3 * 100 [%] = 30[%].
c) 80[%] z liczby 150.
80[%] * 150 = 0,8 *150 = 120.
80[%] / 100[% ]= 0,8.
Z poszanowaniem: zbigniew63.