Tiles

From how many tiles 20 cm by 30 cm we can build a square of maximum dimensions, if we have maximum 881 tiles.

Correct result:

n =  864

Solution:

20=2⋅10 30=3⋅10 S=ab=2x3x⋅100=6x2⋅100  6x2=881 x2=146.83 x≐12.12≐12  n=6x2=6⋅122=864

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