book Maths Puzzle Numerical Ability

I have one more (18x^5y^2/6x^2y^-4)^-1. I am hoping with the explantion I will be able to understand more. Thank you for your help..

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Could someone out there help me solve this problem?

A tree casts a shodow that measures 5 m. At the same time, a meter stick casts a shodow that is 0.4 m long. How tall is the tree?

Thank you,
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