2:3=a:b
a=⅔b
Obw=20
2a+2b=20
2*²/₃b +2b=20
3⅓b=20/:3⅓
b=6 => a=²/₃*6 a=4
P=a*b
P=4*6
P=24
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2:3=a:b
a=⅔b
Obw=20
2a+2b=20
2*²/₃b +2b=20
3⅓b=20/:3⅓
b=6 => a=²/₃*6 a=4
P=a*b
P=4*6
P=24