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0.35x20 =7
> 7 : 0.35 = 20
4.5x...=54
4.5x12=54
> 54 : 4.5 = 12
0,35P= 7
35/100 P= 7
P = 700/35 = 20
4,5T = 54
45/10 T= 54
T = 540/45 = 12