There are 20 gallons of 20% butterbeer solution.
Assume there are x gallons of 80% solution.
So total amount of the solution will be (x+20) gallons
The final solution is 50%.
So, we can set up the equation as:

.
Thus, there will be 20 gallons of 80% butterbeer solution that is needed to be mixed with 20 gallons of 20% butterbeer solution.
Reflection is when the pre-image is flipped over a line.
Lets get common fractions between 1/10 and 1/4, so we now have the fractions 2/20 and 5/20. After we add them we have 7/20. If 35% (7/20) of the points scored is 21, then total points scored is 60. (21 / .35)
Scientific notation means -- one digit before the decimal point, all the others after it; -- count jow many places you have to move the decimal point to make the number look like that; -- left is positive, right is negative; -- after the digits, write " x 10 to the power of" that number from moving the point. / / / / You're starting with 0.006468 . You want it to be 6.468 . You have yo move the decimal point 3 places to the right ... that makes the power -3 . Finally, in scientific notation, it's 6.468 x 10 to the -3 power.
Answer:
0,7
Step-by-step explanation:
Have a nice day.