Question 1210402
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It should be clear from the given statement of the problem that there are many possible answers for the number of dogs.<br>
Each dog has 4 legs; each kid has 2.  Those are both even numbers, so the total number of legs for any numbers of dogs and kids will be even.<br>
2 is the smallest even number, so you could have a total of 30 legs with only kids.<br>
30 is not a multiple of 4, so you can't get a total of 30 legs with only dogs.<br>
Obviously the number of dogs and the number of kids must be non-negative integers.<br>
So the number of dogs can be any non-negative integer for which the total number of dog legs is less than 30.<br>
ANSWER: The number of dogs can be any integer from 0 to 7 inclusive.<br>