Tiles

The tile has the shape of a square with a side of 15 cm. What dimensions can a rectangle composed of 90 of these tiles have so that no tile remains?

Correct answer:

a₁ =  15 cm
b₁ =  1350 cm

Step-by-step explanation:

$b_1=a_0\cdot 90=15\cdot 90=1350\text{ cm}$

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