Mary celebrates her birthday every year from the very first year.
The number of candles on her cake used reflects her age : 1 at age of 1, 2 at age of 2, 3 at age of 3 etc…
Up to now, she has blow out a total of 946 candles.
Questions:
P.S. If you think there are still colleagues or friends (internal or external) you think who can be interested in those quizzes, please let let them know....
Kuo-Chang
You can also calculate this easily in Excel. Just make a column (column A) with numbers 1,2,3, etc. In the column next to it calculate the number of candles. The first cell (B1) gets: SUM($A$1:A1) and drag this down. You will see that at age 43 946 candles have been blown out. Now copy both columns with an offset of 5 downwards and you will get the results for a second person 5 years younger. Now make a new column with the sum of the candles of each sister and you will get the total number of candles blown out by both sisters. You will easily find that for 1687 sister 1 is 43 and sister 2 is 38.