Kimberley, Ela, and Houston all are sent to collect firewood by their grammy. Kimberley collects ten pounds of firewood, and Houston collects 12 pounds of firewood. If the three of them managed to collect a total of 35 pounds of firewood, how many pounds were collected by Ela? Think carefully first, then make a decision:
Kimberley and Houston collected 10 + 12 = 22 pounds of firewood. You can find how much Ela collected by subtracting that amount from the total amount collected: 35 - 22 = 13 pounds. So, the answer is 13.