Answer:
2;90
Explanation:
Case 1
[tex]\begin{array}{rcl}\dfrac{54}{3} & = & \dfrac{36}{x}\\\\18 & = & \dfrac{36}{x}\\18x & = & 36\\x & = & \mathbf{2}\\\end{array}[/tex]
Case 2
[tex]\begin{array}{rcl}\\\dfrac{54}{3} &=& \dfrac{x}{5}\\\\18&= & \dfrac{x}{5}\\x&= & \mathbf{90}\\\end{array}[/tex]
