Answer:
12 days
Step-by-step explanation:
Jeffrey's rate is 1/6 house per day; together their rate is 1/4 house per day.
Their total rate is the sum of their individual rates, so we have ...
total rate = Jeffrey's rate + Helper's rate
1/4 house/day = 1/6 house/day + Helper's rate
(1/4 -1/6) house/day = Helper's rate = 1/12 house per day
It would take the Helper 12 days to paint the house alone.
