GK 2016 Q2
2. Jenny had to add 26 to a certain number. Instead she subtracted 26 and obtained −14. What number should she have obtained?
- A 28
- B 32
- C 36
- D 38
- E 42
Grey Kangaroo 2016, Question 2. © UK Mathematics Trust. Original paper on ukmt.org.uk
Answer: D 38
Jenny subtracted 26 instead of adding 26 and obtained −14. Therefore to obtain the answer she should have obtained, she must add two lots of 26 to −14. Therefore the number she should have obtained is −14 + 2 × 26 = −14 + 52 = 38.
Solution © UK Mathematics Trust, from the GK 2016 solutions.