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2014-09-21T13:57:18+03:00
A/b=2.5; a=2.5 b
a-b=90; 2,5b-b=90
1,5b=90;
b=60
a=150
a*b=9000
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2014-09-21T13:58:32+03:00
A/b=25/10=>10a=25b
a-b=90=>a=90+b

10a=25b
10*(90+b)=25b
900+10b=25b
900=25b-10b
900=15b
b=900/15
b=60
a=90+b=>a=150
a*b=150*60=9000
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