To express the situation with an inequality, we need to take into account the weights of the items and the maximum weight capacity of the box.
Given:
- Each board game weighs 3 pounds, so the total weight of \( x \) board games is \( 3x \) pounds.
- Each remote controlled car weighs 1.5 pounds, so the total weight of \( y \) remote controlled cars is \( 1.5y \) pounds.
- The box can hold no more than 25 pounds.
We can combine these expressions to form an inequality:
\[ 3x + 1.5y \leq 25 \]
So the inequality \( 3x + 1.5y \leq 25 \) represents the situation of packing board games and remote controlled cars in the box.