So, we know that Richie is 3.5 inches shorter than will. you need to focus on how tall Derek is, in other to find how tall Richie is. so I think the problem is 58 ( which I got from adding 56+2) - 3.5= 54.5: therefore, Richie is 54.5 tall. for the second question, you will do 58-54.5=3.5, 3.5 taller than Richie.
