Answer :
To solve this problem, we need to determine how many days the parrot ate sunflower seeds last week. We'll start by understanding the conditions given:
- Last week, the parrot ate either 3 sunflower seeds or 5 peanuts each day.
- The parrot ate exactly 20 peanuts last week.
Let's break down the solution step-by-step:
Calculate the Number of Days the Parrot Ate Peanuts:
The parrot ate 5 peanuts in a day.
If the parrot ate 20 peanuts in total, we can find out how many days it ate peanuts by dividing:
[tex]\text{Number of days eating peanuts} = \frac{20 \text{ peanuts}}{5 \text{ peanuts per day}} = 4 \text{ days}[/tex]
So, the parrot ate peanuts for 4 days last week.
Determine the Total Number of Days in a Week:
There are 7 days in a week.
Calculate the Number of Days the Parrot Ate Sunflower Seeds:
The rest of the days are when the parrot ate sunflower seeds. Therefore:
[tex]\text{Number of days eating sunflower seeds} = 7 \text{ days} - 4 \text{ days} = 3 \text{ days}[/tex]
Calculate the Total Sunflower Seeds Eaten:
The parrot eats 3 sunflower seeds per day. Thus, over the remaining 3 days:
[tex]\text{Total sunflower seeds} = 3 \text{ seeds per day} \times 3 \text{ days} = 9 \text{ sunflower seeds}[/tex]
So, the answer is that the parrot ate 9 sunflower seeds for the rest of the days last week. The correct choice is b. 9.
