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This content is taken from the Davidson Institute of Science Education at the Weizmann Institute of Science's online course, Maths Puzzles: Cryptarithms, Symbologies and Secret Codes. Join the course to learn more.
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## Davidson Institute of Science Education at the Weizmann Institute of Science

Skip to 0 minutes and 0 seconds So, our challenge was to solve the barcode here. That’s pretty easy - especially if you have this… The table of UPC. But even if you don’t have that table… from the row above of the puzzle we can see the symmetry in the barcode - you see this on the left hand is the same number - because they are the same barcode - one thin and one thick. and this on the right hand side of the barcode is one thick, blank and then one thin, again this is repeated, so this does look like the 999,999 we saw before, and indeed, we get here a barcode which is in UPC 999,999. as you can see that in the UPC table.

Skip to 0 minutes and 58 seconds So, we know that times 7 this is equal to 999,999.

# Solution to barcode section of the alien challenge

Well done! Now let’s summarise this week…