Answer:
Let's say the height of the tower is x
<=> [tex]\frac{x}{2}[/tex] = [tex]\frac{49}{2.5}[/tex]
<=> 2.5x = 49 * 2
<=> x = [tex]\frac{98}{2.5}[/tex]
<=> 39.2
Round the answer: 39 m