Two cargo trains are linked together making up a total of 22 cars. the cars from one of the trains are carrying 15 tons each and those from the other train are carrying 20 tons each. if the total cargo weight ranges from 380 to 400 tons what is the range of the number of 20 ton cars

Where are the calculations?

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.