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25% - 55,25
100% - x
25%x=55,25*100%
0,25x=55,25*1
0,25x=55,25/:0,25
x=221
b)
45% - 63
100% - x
45%x=63*100%
0,45x=63*1
0,45x=63/:0,45
x=140
c)
30% - 20,40
100% - x
30%x=20,4*100%
0,3x=20,4*1
0,3x=20,4/:0,3
x=68
55,25 x 4 = 221
100% = 221
b)
63 x 2 = 126 (to jest 90%)
126 : 9 = 14 (10%)
14 x 10 = 140 (to jest 100%)
100% - 140
c) 20,40 : 3 = 6,8 (10%)
6,8 x 10 = 68 (100%)
100% - 68