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If you need some boosters to refresh your mind, you have come to the right place.
Brightside has compiled a series of riddles designed to stimulate your brain and test your intelligence.
You might find that some of them are rather straightforward with a little bit of thought, while others require a little more pondering.
Have a look at them in the gallery above and put yourself to the test. Answers can be found in the next image following each question.