Every few weeks we like to ask you a challenging question to flex your mental muscles. Now you can see which puzzlers have been quickest to send in the correct answers. Congratulations to our five speediest solvers - Abhinaw Kumar, Michelle Tatoy, Borulkar Vaibhav, Caroline Thai and Mansi Malik – and to all of you who were clever enough to crack this conundrum.
For those of you already in the game, here's the answer to our June 26 'coin challenge' conundrum: Create two sets of ten coins. Flip the coins in one of the sets over, and leave the coins in the other set alone. The first set of ten coins will have the same number of heads and tails as the other set of ten coins.
Be on the lookout for our next challenge, which we'll post to the Careers Blog soon. Maybe you can be in our next group of winners!