Any help would be appreciated I am not very sure where to start for this question

Suppose that two roommates share an apartment in which each roommate has his/ her own room. Suppose also that each agent can engage in only two activities: cleaning and washing dishes. Roommate 1 has production possibilities frontier given by the function W + W = 4, and the production possibilities frontier of roommate 2 is given by W + W = 4, where cleaningi denotes the amount of cleaning produced by roommate 2' and dishwashingi denotes the amount of dishes washed by roommate i. For simplicity, we assume that each roommate's preferences are such that they always consume cleaning and dishwashing in equal proportions. Suppose that all gains from trade are divided equally between the roommates. Determine how much cleaning and dishwashing each agent consumes when the agents can trade