1.
Let a1,a2,,a30a_1, a_2, \ldots, a_{30} be an A.P., S=i=130aiS = \sum_{i=1}^{30} a_i and T=i=115a2i1T = \sum_{i=1}^{15} a_{2i-1}. If a5=27a_5 = 27 and S2T=75S - 2T = 75, then a10a_{10} is equal to: