The phrase "added that the answer" is correct and usable in written English.
It can be used when someone is reporting or paraphrasing what another person has said, particularly in contexts involving responses or explanations.
Example: "She added that the answer to the question was more complex than initially thought."
Alternatives: "stated that the response" or "mentioned that the solution".
He added that the answer, as far as the United States was concerned, was Allawi, who, despite his dubious past, was "the nearest thing to an Iraqi with whom the White House could salvage the nation".
She added that the answer lay in making sure community services and social care were working together to keep people living independently.
The Goldman Prize winner added that the answer was not to bury or burn the waste, allowing the problem to "disappear" because out of sight was out of mind.
Brown added that the answer didn't necessarily mean the White House was contradicting what it told drug makers.
At the hearing, Ms. Higgins asked, "What's the nexus between commuting and fatigue?" "Boy, that's difficult," Mr. Mitchel answered, adding that the answer would depend on the individual.
He denied any involvement with drugs before he became chairman, but added: "That doesn't answer the earlier question.
She added that the one answer we'd never get from her is her age.
Eschewing the personal nature of the director's challenge, the president added that the government would answer them all once it had presented the secondary energy legislation.
At the end of last week, President Obama reëntered the discussion, asking, if Trayvon Martin had been of age and armed, "Do we actually think that he would have been justified in shooting Mr. Zimmerman... because he felt threatened?" He added that, if the answer is "at least ambiguous," then "we might want to examine those kinds of laws".
West answered, "Yes", then added, "That's up to the store managers, of course".
Comey added, "That's a question that will be answered by the investigation".
