AlgebraHardNumber of pages from a fraction read
Algebra practice question
After reading two thirds of a book and then 10 more pages, Ines has read 40 pages. How many pages does the book have?
Answer: 45
(2/3)p + 10 = 40 gives (2/3)p = 30, so p = 45.
Common wrong answers
- If you answered 20
- 20 is two thirds of 30.
- If you answered 30
- 30 is the pages read before the extra 10.
- If you answered 75
- 75 multiplies 50 by 3/2, adding the 10 instead of subtracting.
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