The stiffness of a diving board is proportional to the cube of its thickness and inversely proportional to the cube of its length.If diving board A length is twice as long as diving board B and has 8 times the stiffness of diving board B,what is the ratio of the thickness of diving board A to that of diving board B ?
I was stumped by this question until i saw the explanation as to pick nos for thickness and length.I understood the problem.But how to know that we have to pick nos for particular variable,like why didn't we picked nos for stiffness ? is there any strategy that can help me with this ?