Gavin and Maria are a team. Gavin makes robots, and Maria fits them for fancy robot clothes. They have two models. Model One is very small at only 6.3 inches. The other is bigger, but Gavin only gave Maria a calculation as the robot is still in production. Gavin wanted it to be 3 times the size of Model One, but it turns out the prototype is 6.3 inches shorter than that. How big is the prototype?
6.3 in * 3 = 18.9 in
so, what is 6.3 in less than that?
I must say, someone cannot follow design specs very well. It's only /23 as big as it was supposed to be.