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2014-09-18T20:34:06+03:00

a/4=b/5 =(a+b)/9= 18/9=2    a/4=2   a=8      b/5=2    b=10
2014-09-18T20:34:43+03:00

a+b=18
a/4 =b/5(b supra 5) = K

=> a=4*K=4K
     b=5*K=5K
     a+b = 9K => 9K=18

=>K=18:9 => K=2

=> a=4K=4*2=8=>b=5K=>b=5*2=>b=10