IMC 2013 Q4
4. A standard pack of pumpkin seeds contains 40 seeds. A special pack contains 25% more seeds. Rachel bought a special pack and 70% of the seeds germinated. How many pumpkin plants did Rachel have?
- A 20
- B 25
- C 28
- D 35
- E 50
Intermediate Mathematical Challenge 2013, Question 4. © UK Mathematics Trust. Original paper on ukmt.org.uk
Answer: D 35
The number of seeds in a special packet is 1.25 × 40 = 50. So the number of seeds which germinate is 0.7 × 50 = 35.
Solution © UK Mathematics Trust, from the IMC 2013 solutions. Longer versions with investigations: Solutions and investigations (PDF).