Correct Formula for Volume

It was a typical Tuesday. 

I was doing math with my fifth grader.

When I am teaching my children, I try to give them my undivided attention. Church business, ministry things, laundry, and bills take a back seat. 

It was a good thing they did on Tuesday because math needed my full, focused attention. 

“A rectangular tank is 90cm long and 50cm wide. It contains 162 liters of water when it is ⅔ full. Find the height of the tank.”

“Well,” I told my daughter, “what I do for proble...