Your children never cease to amaze me! Whilst celebrating our Queeen's 90th birthday I set the children the above challenge. Within a couple of minutes the children had quickly realised that you needed to work it out in stages and had calculated that the Queen would have blown out  28 candles and by her 15 th birthday she would have blown out a whopping 120 candles. That' s a lot of puff! Imagine how many she will have blown out by her 90th birthday and that is only calculating for one birthday cake a year and not the two birthdays our Queen celebrates!