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II x
III 0,3dm + x
IV x
razem 4x + 0,6 dm= 5dm
4x=4,4
x=1,1
II 3,50
I 20% z 3, 50 = 0,70
3,50+0,70=4,20
2*4,20 +3*3,50= 18,90
50= 2a+ 2b
50= 2* 5 + 2 (5+b)
50= 10 + 10 + 2b
30= 2b
b = 15
P= a*b
P=5* 15 = 75
odp. pole wynosi 75