I would say 3. 21/7=3. 3 boxes. 7 hard in each.
Answer:
x=10, y=6
Step-by-step explanation:
the send equation minus the first.
(5x+y)-(3x+y)=56-36
2x=20--->x=10
then put x=10 to the first equation, 3*10+y=36, get y=6
