SECTION 4: SUBSTITUTION AND MIXED CODES (6 minutes, 8 questions)
Each question gives a substitution rule, keyword or worked example pair. Work out exactly how each letter is replaced, then apply the same rule to the new word. A different rule may apply in each question.
Q1. In a code, the letters of the keyword BLUEPRINTS stand for the digits 0 to 9 in order, so B=0, L=1, U=2, E=3, P=4, R=5, I=6, N=7, T=8 and S=9. What number is represented by the word RUNT?
- A) 5278
- B) 5287
- C) 2578
- D) 4278
- E) 5279
(Total for Question 25 is 1 mark)