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Challenge 3 of Open Boxes was solved by us, two Year 4 boys named Rhys and Jack from Castle Cove Public School in Sydney Australia. We chose to use the strategy “guess and check” because we could experiment with different combinations of lego blocks. We thought we had the answer but then we checked and found that it was wrong. We kept on trying adding and taking away blocks from the rows and columns and finally got the answer. What we got was 13 long 4 wide and 3 up = 112 blocks. We showed our solution using Lego build with Chrome.