Answer: Tim mixed 0.4 parts of vinegar with each part of water.
Step-by-step explanation: Given that Tim mixed 2 parts vinegar and 5 parts water to make a cleaning liquid.
We are to find the number of parts of vinegar that Tim mix with each part of water.
We will be using the UNITARY method to solve the problem.
Number of parts of vinegar mix with 5 parts of water = 2.
Therefore, the number of parts of vinegar mix with 1 part of water i given by

Thus, Tim mixed 0.4 parts of vinegar with each part of water.