IMC 2020 Q3
3. What is the difference between 25% of £37 and 25% of £17?
- A £4.25
- B £5
- C £6
- D £7.50
- E £9.25
Intermediate Mathematical Challenge 2020, Question 3. © UK Mathematics Trust. Original paper on ukmt.org.uk
Answer: B £5
The required difference is 25% of (£37 - £17) = 25% of £20.
Hence the difference between 25% of £37 and 25% of £17 is £5.
Solution © UK Mathematics Trust, from the IMC 2020 solutions. Longer versions with investigations: Solutions and investigations (PDF).