In order to find 30% of a number, we can multiply the number by 0.3. So, if 30% of a number is equal to 18, we can set up the equation 0.3 * x = 18, where x is the number we are trying to find. Solving for x, we divide both sides of the equation by 0.3, resulting in x = 18 / 0.3. Simplifying this expression, we find that x = 60. Therefore, the number that satisfies the equation is 60.