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a-b=2.5(pers 2)
pers 1 - pers 2->2b=17.5
b=8,75
a=11.25
a:b=1.28
jdi b : a=1:1.28(100)=100:128=25:32
a-b = 2,5
a=20-b
20-b-b=2,5
20-2,5=2b
17,5/2=b
b=8,875
a=20-8,875
a=11,125
b:a = 8,875 ÷ 11,125 = 67÷89