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Beat-D-GMAT
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Double: can be used with Noun/ Verb/ Adjective/ Adverb
e.g.:
Noun: 36 is the double of 18
Verb: The population doubled within 50 years.
Adjective: An egg with a double yolk
Adverb: His eyes were double bright.
Twice is always adverb. Usage depends upon the structure of the sentence. In
GMAT Twice as...much....as, twice as many....as are frequently tested.
