Nora used a spiral notebook to take notes in three classes
• She used 78 pages for math.
• She used 21 more pages for math than for science.
• She used 14 more pages for language than for science.
How many pages of the notebook did Nora use for language?
Let "x" be the number of pages Nora used for science.
Nora used x + 21 pages for math.
She used x + 14 pages for language.
The total number of pages used is x + (x + 21) + (x + 14) = 3x + 35.
Given that she used 78 pages for math, 3x + 35 = 78.
Subtracting 35 from both sides, we get 3x = 43.
Dividing both sides by 3, we get x = 43 / 3 = <<43/3=14.333333333333334>>14.33 pages.
Therefore, Nora used 14.33 + 14 = <<14.33+14=28.33>>28.33 pages for language. Answer: \boxed{28}.