Hints for puzzle 20

Read only as far down this list as you need to. Hint 1 is nearly free; hint 4 will effectively hand you the opening.

  1. What is covered. These ten rounds draw on: Food energy, Sugar, Protein, Calories burned, flight distance.
  2. The shape of the set. Rounds are ordered easiest first, so round 1 is a landslide and round 10 is close. Answer the early ones fast and save your thinking for the end.
  3. How many are genuinely hard. 1 of these rounds are near coin-flips, where the two answers sit within 30% of each other.
  4. Your opener. Round 1 asks: Which has more calories per 100 g?