Problem number 18 Frank made a domino snake out of seven tiles You put the tiles next to each other so that the sides with the same number of dots were touching Originally the snake had 33 dots on its back However, his brother George took away two tiles from the snake see the picture How many dots were in the place with the question mark? two three four five or six This problem will take several steps to solve so make sure you pay attention to all of the steps First we're going to count all the dots on the snake that are remaining So we see that is 11 there Then 17 then 19 Then 20 and then there's 22. So currently we have 22 Dots on the snake and There are 33 dots originally so 33 minus 22 is 11 This tells us that these two tiles here have 11 dots on them total and we also know That the dots on each side have to be the same which means this one would be two And then this one would be one 11 minus 3 is 8 So these two add up to 8 But they have to be the same number Because they're touching so half of a is 4 which means each of these tiles will be 4 Which means our answer is C 4

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