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26 May, 07:36

Originally the dimensions of a rectangle were 20cm by 23cm. When both dimensions were decreased by the same amount, the area of the rectangle decreases by 120. Find the dimensions of the rectangle.

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  1. 26 May, 08:30
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    The answer is 17cm by 20cm.

    The original area is 460cm (20x23), minus 120cm gives a new area of 340cm.

    20cm-3cm=17cm and 23cm-3cm=20cm

    17cmx20cm = 340cm
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