A large container holds 30 liters of liquid concentrate used to make a cleaning solution. This amount of concentrate is typically used to make 240 liters of the standard cleaning solution. However, a new, more efficient dilution method allows the same 30 liters of concentrate to produce 360 liters of the standard solution. If a facility needs to produce only 240 liters of the standard solution using the new efficient dilution method, how many liters of the concentrate should they use?
15
20
25
30
