exam Maths Puzzle Numerical Ability

HOW TALL IS A TREE THAT CAST A 25FT SHADOW AT THE SAME TIME A 9FT LIGHT POLES CASTS A 15FT SHADOW?

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Ok, I'm stuck on this question. I am suppose to formulate a word problem from day-to-day life that can be translated into a linear equation with three variables.

This is what I find value of x and y 5y+38+8x+26+3x=180