True since each inch is 4 miles you time 6 by 4 false it says it is 12 miles so you divide that by 4 to get the inches false if A to B is 24 and B to C is 12 miles there is clearly much more then 4 miles between A and C
4 tanks will have four meanwhile 1 tank will have 5. also there will be 3 plants in the tanks meanwhile only 1 tank will have 4. this is what i got by reading your problem, i couldnt find anything about it on the internet but i hope this helps.