He's inclined to put two and two together and make five ( = make an incorrect guess from what he sees , hears, etc. ).

他爱捕风捉影, 听风就是雨.

《简明英汉词典》

Right off the bat you should have put two and two together.

你本应该马上作出合理推论的.

辞典例句

She had sharp enough with to put two and two together.

她有够锐利的机智作合理推论.

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It wasn't until I put two and two together that I discovered Janet was your sister.

直到我把相关的事连在一起,我才发现原来珍娜是你的姊姊.

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He had put two and two together and decided where they had probably, gone.

衡量种种事实后,他确定他们可能的去向.

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