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4/8X+2/8X+1/8X=21
7/8X=21
X=24
Liczba to x
0,5x+0,25x+0,125x=21
0,875x=21
zatem x=24
4/8x + 2/8x + 1/8x = 21
7/8x = 21
21 razy 8 = 168
168 : 7 = 24
Odp. Ta liczba to 24.