Milton has some books about zoology and 4 times as many books about botany. If he has 80 books total, how many zoology books does he have? Let's think step by step and output the final answer after "####".
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Let z be the number of zoology books and b be the number of botany books. We know that z + b = 80 and b = 4z.
Substituting the second equation into the first equation, we get z + 4z = 80
Combining like terms, we get 5z = 80
Dividing both sides by 5, we get z = 16
#### 16
Milton has some books about zoology and 4 times as many books about botany. If he has 80 books total, how many zoology books does he have?
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