A mistake was made in mixing the lemonade—
PLEASE HELP!!

Part A:

Part B:

and

Step-by-step explanation:

Part A:

The inicial concentration of the lemonade is 50%, and the volume is 4 quarts, and we will add x quarts of a lemonade with a concentration of 100%, so the total volume will be y, and the concentration will be 0.7, so we have that:

Using the value of y from the first equation in the second one, we have:

Part B:

If he shoots a total of ten targets, we can write the equation:

Each stationary target is 2 points, and each moving target is 3 points, so if the total points is 23, we have:

If we subtract the second equation by two times the first one, we have:

⇒

answer:

a=9

step-by-step explanation: lmk if you need a explanation