Cody and Tyler were once the same height. Since then, Tyler's height has increased by 20%, while Cody has grown half as much. If Tyler is 4 feet tall now, how many inches tall is Cody now?
If Tyler's original height was x it is now x + 0.20x or 1.20x.
Since he is not 4 feet tall: 1.20x = 4 ---> x = 4 / 1.2 = 3.33.
So, both Tyler and Cody were 3.33 feet (or 3 feet 4 inches)
If Cody grew at 10%, we need to add 10% to his original height: 10% of 3 feet is 0.30 feet or 3.6 inches.
Also, 10% of 4 inches is 0.40 inches.
Starting with 3 feet 4 inches and adding 3.6 inches and 0.40 inches, we get 3 feet 8 inches.