Answer:
2.7 liters.
Explanation:
Dr. Watson combines
detergent = 400 ml
alcohol = 800 ml
water = 1500 ml
Total amount of solution = 400 + 800 + 1500 = 2700 ml
1000 milliliters = 1 liter
2700 milliliters =

= 2.7 liters
The solution would be 2.7 liters