Each correct answer gives a number. Use the scrambled letter map to translate those numbers into letters. The five letters you uncover form an anagram – solve it to unlock the codeword. Round normally to get to a rational number, if needed.
3 = R | 16 = A | 13 = V | 2 = U | 1 = J | 17 = H | 15 = N | 5 = C | 20 = M | 8 = T















