Number 1 question is a machine grinds 2/7 pounds of spices in 1/3 second. what is the machines rate, in pounds per second, of grinding spices.

Well, if you know it grinds 2/7lbs of spices in 1/3 of a second, you need to find how many lbs it can grind in 1 second. You can do this by multiplying both sides by 3: 27=13 27×3=67 13×3=1 Therefore, 67=1 The machine grinds 6/7 lbs of spices per second. Hope this helped!

2/7 pounds= 1/3 second
  ???         =1 second
2\7 x 1 divided by 1\3
2\7 x 3\1
answer=6\7 pounds