A junk seller has 6 cartons of old books. Each carton contains 7 books, and he has 4 extra books. Write an algebraic expression for the total number of books using $x$ for books per carton and calculate the total number.

Step-by-step solution

1. Express total books as $6x+4$, where $x$ is books per carton.
2. Substitute $x=7$ (since each carton has 7 books).
3. Compute $6\ast 7=42$.
4. Add extra books: $42+4=46$.
5. Total number of books is 46.

Concept tested: Form an algebraic expression and evaluate

Published 4 October 2026 · How this solution was prepared and checked