Basic Mathematics
# Basic Arithmetic

**after** spending $\$10$ on groceries. How much money (in $) did Juan have before going to the grocery store?

Sudoku is a logic-based combinatorial number-placement puzzle. The objective is to fill a $9 \times 9$ grid with digits 1 to 9 such that each column, row and $3 \times 3$ box contains all the digits from 1 to 9.

If a Sudoku puzzle is filled correctly, what is the sum of all of the entries in the $9 \times 9$ grid?