Answered

a rectangle is composed of 15 squares.the threemiddle square of the rectangle are painted.how many non-painted square are there if there are 20 rectangles?​

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Answer:

120 squares are non-painted

SOLUTION

rectangle = 20 squares

therefore, 20 rectangle = 20(15) = 300 square

painted square = 20(3) = 180

non-painted square = 300-180 = 120

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