1. **State the problem:** Kiko saved 120 and buys gift cards costing 10 each. We want to find the unknown value represented by a variable. 2. **Identify the unknown variable:** Let $x$ be the number of gift cards Kiko bought. 3. **Write the equation:** The total cost of gift cards is $10x$. Since Kiko saved 120, the money left after buying gift cards is $w = 120 - 10x$. 4. **Explain the equation:** This equation shows that the amount of money left ($w$) equals the initial savings (120) minus the total cost of gift cards ($10x$). 5. **Check if Kiko bought 5 cards:** Substitute $x=5$ into the equation: $$w = 120 - 10 \times 5 = 120 - 50 = 70$$ So, if Kiko bought 5 cards, he has 70 left. **Final answers:** - Unknown value: number of gift cards $x$ - Correct equation: $w = 120 - 10x$ - Money left after buying 5 cards: 70