Give the solution proportion of the given number
 => x : 45 = 8 : 18
 => Let’s start solving the proportion
 => 45 * 8 = 360
 => 360 / 18 =20
 Thus the answer is letter B. X = 20
 let’s check if we have correct answer
 => 20 * 18 = 360
 => 360 / 45 = 8
 => 20 * 18 = 360
 => 360 / 8 = 45
 Thus, we have the same answer.