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twice is used for comparison, double is mostly used as an adjective.

here this question is for comparison. A vs D. let see comparison of what. "unsolved problem" compared with ???

D changed the meaning as it is talking about all the problem.
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This isn't a wonderful sentence, but I think what's confounding many people here is that "confounded" is intended as a verb, not an adjective. We're not talking about "confounded mathematicians." We're saying that the current number is twice the number that confounded the mathematicians of the 50's.
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DmitryFarber
This isn't a wonderful sentence, but I think what's confounding many people here is that "confounded" is intended as a verb, not an adjective. We're not talking about "confounded mathematicians." We're saying that the current number is twice the number that confounded the mathematicians of the 50's.

Hi DmitryFarber

Can you please Explain how D is grammatically wrong??
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rahul16singh28 Sure. First off, it works just fine to compare modifiers rather than nouns, so we don't need to add the words "the problems." When we do, it creates a potential misinterpretation. We could read this as "Mathematicians discovering twice as many unsolved problems as the problems that confounded mathematicians did." In other words, grammatically, we are comparing mathematicians to unsolved problems. This might seem like a really crazy way to read the sentence, but the structure creates that expectation. Think of the sentence "I scored ten goals, twice as many as the top player on the opposing team." Notice that here I'm comparing what I did to what the other player did. That's the same structure we see in D.
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