v = 50b / v = 50 × b
1 bottle of sub rcharge = 50
vitamins v = the total number of vitamins
b = number of bottles
For getting the answer of the total number of vitamins (v) you need to multiply the whole number of bottles (b) with the amount of vitamins present in a one bottle (50 vitamins). So , the answer is v = 50 × b / v =50b..