Answer:
Both Gia and her sister will donate 16 hats each.
Explanation:
Let's start by finding the common number of hats that both Gia and her sister will need to knit in order to make their donation.
Let's say x is the number of weeks they will need to knit to reach their goal.
Gia will knit 6 hats initially and then 2 more hats per week, so the number of hats she will knit in x weeks is:
6 + 2x
Gia's sister will knit 1 hat initially and then 3 more hats per week, so the number of hats she will knit in x weeks is:
1 + 3x
Since they want to donate the same number of hats, we can set these two expressions equal to each other and solve for x:
6 + 2x = 1 + 3x
Subtracting 2x from both sides, we get:
6 = 1 + x
Subtracting 1 from both sides, we get:
5 = x
So they will need to knit for 5 weeks to reach their goal.
Now we can substitute x = 5 into either of the expressions we derived earlier to find out how many hats each girl will donate.
Gia will knit:
6 + 2x = 6 + 2(5) = 16 hats
Gia's sister will knit:
1 + 3x = 1 + 3(5) = 16 hats
Therefore, both Gia and her sister will donate 16 hats each.