a/b=4/5
2a+2b=36
5a=4b
a+b=18 a=18-b
5(18-b)=4b
90-5b=4b
9b=90
b=10
a=18-10=8
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a/b=4/5
2a+2b=36
5a=4b
a+b=18 a=18-b
5(18-b)=4b
90-5b=4b
9b=90
b=10
a=18-10=8