Answer:
Based on the ratio Nisha observed, the best estimate for the total number of games in the store is 120.
Step-by-step explanation:
# Given values
returned_games = 18
observed_games = 20
observed_used_games = 3
# Observed ratio of used games
observed_ratio = observed_used_games / observed_games
# Estimated total number of games in the store
# Assuming the observed ratio of used to total games applies to the entire store
# And knowing the number of returned (used) games, we can estimate the total number of games
estimated_total_games = returned_games / observed_ratio
estimated_total_games