Question139. Dave counted a total of 9 dogs and cats at a shelter. Which of the following could be the ratio of dogs to cats at the shelter? (A) $1: 2$ (B) $1: 3$ (C) $1: 4$ (D) $1: 5$ (E) $1: 6$

Studdy Solution
验证总数是否为9：
- 选项 (A) $1: 2$ 的组合为 $3$ 只狗和 $6$ 只猫，总数为 $3 + 6 = 9$ 。
其他选项没有整数解，因此不符合条件。
符合条件的比例是：
$\boxed{1: 2}$

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