Sixth Grade Challenging Math

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6-50)   Answer

                          The total cost of 1 x 1 square foot tiles is less.

Solution:

To use 1 x 1 square foot tiles, 20 x 31 tiles are needed;

Cost: 20 x 31 x 2= 620 x 2 = $1240

To use 2 x 2 square foot tiles, 20 x 31/4 = 155 tiles are needed;

Cost: 155 x 9 = $1395