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The Puzzle of Diophantus Challenge 152
Beach Volleyball Tournament Challenge 153
The Flood and the Jealous Husbands Challenge 154
One Brick and a Half Challenge 155
Sum of Two Cousins Challenge 156
Completing the sequence Challenge 157
The Multiple of 9 Challenge 158
A Special Symbol Challenge 159
Little John waiting for bus Challenge 160
Watermelon in the sun Challenge 161
As many as possible Challenge 162
Shaking Hands Challenge 163
The Cat, Coffee, and Cake Challenge 164
Curious Words Challenge 165
Renatinha's Chocolates Continues after advertising Challenge 166
How much do you want to earn? Challenge 167
The Grid Logic Challenge 168
Spinning the Coin Challenge 169
Throwing Dice Challenge 170
The Square Starting at 999 Challenge 171
The False Cube Unfolded Challenge 172
Planting a Flower Challenge 173
The 174 Jewelery Auction
Deciphering the word Challenge 175
Birds and Rabbits Challenge 176
Is there Friday 13 every year? Challenge 177
Cracking a Challenge 178 barcode
Letters and Envelopes Challenge 179
Secret Operation Challenge 180
The beggar and the cigarettes