Q: Julian has 80 Facebook friends. 60% are boys and 40% are girls. Boyd has twice as many friends who are girls and has 100 friends total. What percentage of Boyd’s friends are boys?
A: Julian's number of friends who are girls is .40 * 80 = 32. Boyd has twice as many friends as Julian who are girls, a total of 2 * 32 = 64. If Boyd has 100 friends, he has 100 - 64 = 36 boys. The percentage of boys in Boyd's Facebook friends is 36 / 100 * 100 = 36. The answer is 36.

Q: James writes a 3-page letter to 2 different friends twice a week. How many pages does he write a year?
A: He writes each friend 3 * 2 = 6 pages a week. So he writes 6 * 2 = 12 pages every week. That means he writes 12 * 52 = 624 pages a year. The answer is 624.

Q: 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?
A:
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. The answer is 13.