book Maths Puzzle Numerical Ability

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,
Sher

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book Other Question

What would be another way to add 1+3+5+7+9+....499=to equal the sum of 62,500?
Only using odd numbers. We need another way to find the sum of all the odd numbers from 1 to 499 and equal 62,500 the equation x(squared)-2x=0 has two solutions. whats the other?