Question 367330
9*60+3*X=8(60+X)
540+3X=480+8X
3X-8X=480-540
-5X=-60
X=-60/-5
X=12 POUNDS OF THE $3 COFFEE IS USED.
PROOF:
9*60+3*12=8(60+12)
540+36=8*72
576=576