Answer:
Explanation:
The answer is 2. Let's make an equation:
if you know the numbers of both A's and B's you would make something like this to find out how much money Sarah got.
25a + 10b
where a is the number of A's sarah gets and b is the number of B's Sarah gets.
we know how much she got so let's add that:
25a + 10b = 80
we also know the number of B's Sarah got, 3.
25a + 10(3) = 80
simplify:
25a + 30 = 80
now we solve for a by getting it by its self, we can move 30 to the right side of the equation by subtracting 30 from both sides:
25a + 30 = 80
-30 -30
=> 25a = 50
since we did the same thing to both sides of the equation it is still true. We can now further isolate a by dividing both sides by 25
25a = 50
/25 /25
=> a = 2
we now isolated a and we can see that it equals two, therefor Sarah got 2 A's on her report card