12x+10x+8x=18
x= 9/15
I bok: 12*9/15 = 7.2
II bok: 10 *9/15= 6
IIIbok: 8*9/15= 4.8
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12x+10x+8x=18
x= 9/15
I bok: 12*9/15 = 7.2
II bok: 10 *9/15= 6
IIIbok: 8*9/15= 4.8