Shadow and light

Nine meters height poplar tree has a shadow 16.2 meters long. How long shadow have at the same time Joe if he is 1,4m tall?

Correct result:

x =  2.52 m

Solution:

$x=16.2\mathrm{/}9\cdot 1.4={\displaystyle \frac{63}{25}}={\displaystyle \frac{63}{25}}\text{ m}=2.52\text{ m}$

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