a model train has a scale of 5 in : 3ft. if the model train is 30 in tall, then how tall is the real train??

Answer

The real train is 216 feet tall.

Q:What is the scale of the model train? A:The scale of the model train is 5 in : 3ft.
Q:What is the height of the real train? A:Set up a proportion: 5 in / 36 in = x / height of real train. Cross multiply to solve for x: 5 * height of real train = 36 * x. Divide both sides by 5: height of real train = (36 * x) / 5. Plug in given value for x: height of real train = (36 * 30) / 5.