Smart chart shows number of books read by a student each week: Week 1 – 5 books, Week 2 – 7 books, Week 3 – ?, Week 4 – 12 books. If the student read 35 books in total over the four weeks, what is the number of books read in Week 3?

Step-by-step solution

1. Let $x$ be the number of books in Week 3. The total books read = $5+7+x+12$.
2. Set equation equal to given total 35: $5+7+x+12=35$.
3. Add known values: $5+7+12=24$.
4. Subtract 24 from both sides: $x=35–24$.
5. Compute: $x=11$.
6. Thus the student read 11 books in Week 3.

Concept tested: Find missing entry in smart chart

Published 13 October 2026 · How this solution was prepared and checked