A sign 4 meters tall cast a shadow 5 meters long. At the same time, a tree casts a shadow 30 meters long. What is the height of the tree?

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The height of the sign that casts a shadow of 4 meters is = 5 meters

Then

The height of the tree that casts a shadow of 30 meters = (5/4) * 30 meters

= 150/4 meters

= 37.5 meters

So the tree casting a shadow of 30 meters is actually 37.5 meters in height. I hope the procedure is simple enough for you to understand.