Adairy needs 225 gallons of milk containing 6% butterfat. how many gallons each of milk containing 7% butterfat and milk containing 2% butterfat must be used to obtain the desired 225 gallons

Let
x> gallons of milk containing 7% butterfat 
y> gallons of milk containing 2% butterfat 

we know that
x+y=225> x=225-y> equation 1
x*0.07+y*0.02=225*0.06> multiply by 100 both sides
7x+2y=1350> erquation 2

substitute equation 1 in equation 2
7*[225-y]+2y=1350> 1575-7y+2y=1350> 5y=225> y=45 gallons
x=225-y> x=225-45> x=180 gallons

the answer is
180 gallons of milk containing 7% butterfat 
45 gallons of milk containing 2% butterfat 

Step-by-step explanation:

A. 118≥x≥-40

B. Closed circle at 118, shading to the right, and -40 closed circle shading to the left. The inequality represents what the plane can and can't take off in, with the white in the middle being what the plane can take off in, temperature wise and the shading being what the plane cannot take off in.

C. No, because the temperature is above 118, which means that the plane cannot take off