0<a/20<1/4 a=1, a=20<b/15<1/2 b=1, b=21/2<c/21<1 c=19, c=201<d/30<1 1/2 d=31, d=32
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0<a/20<1/4 a=1, a=2
0<b/15<1/2 b=1, b=2
1/2<c/21<1 c=19, c=20
1<d/30<1 1/2 d=31, d=32