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There are 10 candles shown below. One person starts lighting the candles four minutes after arriving and lights four candles every four minutes. Another person starts blowing out the candles five minutes after arriving and blows out three candles every five minutes.
Assuming the lighter and the blower arrive at the same time and all the candles are out to begin with, how many candles will be lit after 25 minutes?
If you try to solve this in your head, you might get confused really quickly.
Try using the Memo function instead.
After 24 minutes, the candle lighter starts lighting again, but at this point eight candles have already been lit, so he can only light the last two.
After 25 minutes, the candle blower starts blowing them out again, so there will only be seven lit.
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