I need to bake three 13x9 cakes but I only have 11x15, 8x11, and 9.25x13.25. What do I do?

13x9=117 But I need three so39x9=35113x27=35111x15=1658x11=889.25x13.25=122.5625165+88+122.5625=375.5625 or:13x9=117 But I need three so39x9=35113x27=

13x9=117
But I need three so
39x9=351
13x27=351

11x15=165
8x11=88
9.25x13.25=122.5625

165+88+122.5625=375.5625

or:13x9=117 But I need three so39x9=35113x27=35111x15=1658x11=889.25x13.25=122.5625165+88+122.5625=375.5625

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