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This is a factor question.

You may use the LCM method to solve.

 

    2  |   480,   700

    2   |  240,  350

    5  |   120,  175

    7  |    28,  35

               4, 5

a)

2 × 2 × 5 × 7 = 140 cm

b)

4 × 5  = 20 tiles

 

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