There are 20 trees in a garden and each of them gives 60 kg fruits a year. With the rise of the number of trees the production decreases. This decrease is 2 kg in year for each tree(over the number 20). When there are 20+x trees how much fruits gives the garden?
I think the formula is (20+x)*60-2x, but I'm not sure at all.
I think the formula is (20+x)*60-2x, but I'm not sure at all.