If Josie uses 2 liters of fruit juice, she needs 5 liters of lemonade. Thus she would have 7 liters of punch. If she were to repeat this process 56/7=8, she would know how many liters the punch would require.
Since she uses 2 liters of fruit juice 8 times, she needs 16 liters of fruit juice
Since she uses 5 liters of lemonade 8 times, she needs 40 liters of lemonade
