Aman buy 10 lemon on 20 and sell 8 lemon on 20 find his profit or loss percent

The problem with this problem is I can't tell how much money he has gained because I don't know how much the lemons are actually worth. If the lemons are worth 20 bucks for 10, then he made 4 bucks, but if they are actually worth 20 bucks for 8, then he made 5 bucks. (i believe everything i said is true but i could be wrong)

step-by-step explanation:

step 1: solve one of the equations for one of the variables. let's solve the first equation for y:

step 2: substitute that equation into the other equation, and solve for x.

step 3: substitute x = 4 x = 4 x=4 into one of the original equations, and solve for y.