



 
Hi Sophia, I like this problem because you can solve it by constructing something or imagining you are constructing something. Suppose you have 16 marshmallows (heads) and 42 toothpicks (feet). If you put two toothpicks in a marshmallow you have a bird and if you put 4 toothpicks in a marshmallow you have a cat. Start by putting two toothpicks in each marshmallow. How many toothpicks did you use? How many are left over? Take two of the left over toothpicks and put them into a bird to turn it into a cat. Continue until you have used all the left over toothpicks. How many cats did you make? How many birds are there? I hope this helps,  


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