Use of applied mathematics during hiring process for developers

many ways. depends on shape of building blocks. if they are cubes, 9 and 4.

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3x3+2x2

depends on block size - it might be that 2 blocks make 1 square - then use 4 blocks and make 2 squares and keep the rest :D

one is from 4 square blocks, other from 9 same blocks(with 1 inside)

√9 + √4 = 13

Use only 8 of them

3² and 2²

squares with 9 and 4 building blocks