2*225 + 2*90 = 2*1/2(30+b) * 15
15* ( 2 *15 + 2* 6) = (30+b) * 15 /:15
30 + 12 = 30 + b
30 + 12 - 30 = b
b = 12
2 sposób
450 + 180 = 15*(30+ b)
630 = 450 + 15b
630 - 450 = 15b
15b = 180
b = 180 : 15
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2*225 + 2*90 = 2*1/2(30+b) * 15
15* ( 2 *15 + 2* 6) = (30+b) * 15 /:15
30 + 12 = 30 + b
30 + 12 - 30 = b
b = 12
2 sposób
2*225 + 2*90 = 2*1/2(30+b) * 15
450 + 180 = 15*(30+ b)
630 = 450 + 15b
630 - 450 = 15b
15b = 180
b = 180 : 15
b = 12