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20lmarks
3 litters, 7 puppies in each litter, 3 x 7= 21 puppies last year
1234cordelianaranjo
in this situation, you are finding how many puppies per litter. you know that there are 3 litters, and that there are 7 puppies per litter, so if you add 7 three times, you get 21. another way you can find it is that you multiply 7*3=21