Question 1180985
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Each day he eats either 9 carrots, or 4, or none.<br>
There is only one combination of 9's and 4's that adds up to 30.<br>
Find that combination (I leave that to you) and finish the problem from there.<br>
Here is a hint: the total number of carrots is an even number; 4 is even but 9 is odd.  That means the number of days he eats 9 carrots must be even.<br>