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29 September, 08:35

Helen has some pens and some square tiles. Each pen is 130mm longet. The sides of each tile are 13mm long. Helen lays ten pens end to end to make a straight line. She makes a line of tiles which is the same length as the line of pens. How many tiles does she use?

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  1. 29 September, 08:40
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    100

    Step-by-step explanation:

    The total length of ten pens laid end-to-end is

    10 pens * 130 mm/1 pen = 1300 mm

    The number of tiles needed to stretch the same length is

    1300 mm * 1 tile/13 mm = 100 tiles

    Helen uses 100 tiles.
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