Final answer:
By dividing the total flour amount (157.86 pounds) by the daily usage (15 pounds), we can estimate that Harry's mother's flour will last for approximately 11 days.
Step-by-step explanation:
To estimate how many days Harry's mother's supply of flour will last if she uses 15 pounds each day,
we can divide the total amount of flour she has by the amount she uses daily.
This can be calculated as follows:
157.86 pounds of flour ÷ 15 pounds per day = 10.524 days
Since we need an estimate, we can round this to the nearest whole number, which gives us approximately 11 days.
It is important to note that this calculation is an estimate, and in practice, the actual usage of flour might slightly vary each day.
Additionally, we are not taking into account the amount of sugar, as the quantity of flour is less and will run out first, determining the duration of the supply.