Basic, and even advanced, mathematical skills come into play for all of the day-to-day activities that the engineering team at British Airways performs. While your interviewer is certainly looking to hear the highest level of math you have completed in your many years of schooling, they are more importantly looking to hear how you apply math skills to your everyday work in this job. Your interviewer wants to hear you display confidence in your ability to solve problems on the job using math skills, so bring up an example from your past that demonstrates this.