GMAT数学一题。帮忙看下，很简单但是和答案不同。

Question

a recipe for soda requires w liters of water for every liter of syrup. if soda is made according to this recipe using m liters of syrup, and sold for j dollars a liter , what will be the gross profit if syrup costs k dollars a liter and water costs nothing?

Answer 1

If the volum of 1 liter syrup added with 1 liter water is 2 liter, soda using m liters of syrup is (m*w+m) liters, which solds j*(m*w+m) dollars. Since the cost of the soda is m*k, the gross profit is j*(m*w+m)-mk, i.e. m*(j*w-k+1).

Answer 2

the gross profit equals the gross dollars sold for minus the gross costs of the syrup.
Gross profit=m*w*j-m*k

Answer 3

翻译；食谱的苏打水需要w升水来每公升的糖浆。如果苏打是根据这个食谱使用m升的糖浆,和出售的j美元一升,什么将是毛利润如果糖浆成本k美元一公升和水成本为零?

Answer 4

mwj-mk
答案是什么？是不是要单位换算呀？