7.5 < a < 10 ;
1/2.5 < 1/b < 1/1.5
7.5/2.5< a/b< 10/1.5
3< a/b< 6 10/15
3< a/b< 6 2/3
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7.5 < a < 10 ;
1/2.5 < 1/b < 1/1.5
7.5/2.5< a/b< 10/1.5
3< a/b< 6 10/15
3< a/b< 6 2/3