The answer is that it is impassible: First, you can't do it.

Second, you can't find two items,their length same,the prob. is 0.Third,the house is dog house or not...The boss think you are not a bookworm.If the boss want to know your Math,the brother's answer is OK,you get the job.If there is an another very strong guy.You use J's answer beat him.This is typical boss question,no matter your answer what is,the boss always can say no.You should continue,you can say if the floor is ...let boss know who you are .Sometimes I ask students like a boss,so I know.