12+8k=48
=>8k=36
=>k=36/8
=>k=4.5
Answer:

Step-by-step explanation:
Consider the quadratic expression

First, find its discriminant:

Note that
then 
Use quadratic formula to find the roots:

Now, given quadratic expression is equivalent to

<span>21 1/3 children will be served with the amount of 4 gallons of cider.</span>
A quotient of a number 21 is 3 and 63
Hope this helps!