Question

U need to cut down 3 trees to get about 5 kilograms of bark. About how many trees u have to cut down each year to make enough paclitaxel for 60,000 patients

Answer 1

You haven't told us how much paclitaxel is needed for one patient, or how much can be made from one kilogram of bark. So far, then, we don't have enough information to head towards an answer. Sorry.