Answer: So our equation is 
Laura does:

while Sean does:

So sean sums four times the number 2/3, while Laura sums two times the number 4/3, this is because we are working with a multiplication, and the order of the factors does not alter the product.
The two are splitting the equations in different ways.
Answer:
60
Step-by-step explanation:
200*0.30=60
Multiply the percent's by the total cost.
Answer:
A has 77 grams and B has 12 grams.
Step-by-step explanation:
In order to find the amount of fat in both, we need to set up two equations in standard form. First, we can set up one comparing the two amounts and solve for the constant.
A = 6B + 5
A - 6B = 5
Now we can create one using the difference of the two.
A - B = 65
To solve, we now multiply the second equation by -1 and solve for B.
A - 6B = 5
-A + B = -65
----------------
-5B = -60
B = 12
Knowing this we can plug into the equation and find the value of A.
A - B = 65
A - 12 = 65
A = 77