For comparison with other CAS choose from: Axiom Derive Macsyma Maple Reduce
vars := w,p,z,t,s,b
GroebnerBasis[ polys, vars ]
polys := 45p + 35s - 165b - 36,
35p + 40z + 25t - 27s,
15w + 25p s + 30z - 18t - 165b
^
2,
-9w + 15p t + 20z s,
w p + 2z t - 11b^
3,
99w - 11s b + 3b^
2,
b^
2 + 33/50b + 2673/10000
2 {2673 + 6600 b + 10000 b , -9 - 500 b + 200 s, 81 - 1850 b + 750 t, 10287 + 24500 b + 18000 z, -1377 - 3100 b + 1800 p, 3969 + 9500 b + 60000 w}