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If there are only red, blue, and green marbles in a jar, what is the ratio of red to blue marbles? (1) The ratio of red to green marbles is 2:3. (2) The ratio of green to blue marbles is 6:5.
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解析：
题目中含三个未知量，（1）、（2）条件相结合可以计算红色和蓝色珠子的比例，两个条件无法单独决定，故本题选C项。
题目中含三个未知量，（1）、（2）条件相结合可以计算红色和蓝色珠子的比例，两个条件无法单独决定，故本题选C项。
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