At the end of the day, you have $27. You remember taking $15 out of the bank, spending $5 on lunch, and spending $21 on a new phone case. How much money did you have at the beginning of the day?

To find out how much money you had at the beginning of the day, let's set up an equation based on the information provided:

1. **Let $ x $ be the amount of money you had at the beginning of the day.**

2. **You took out $15 from the bank:**
   - This means you added $15 to your initial amount.
   - So, your total amount of money after taking money out is $ x + 15 $.

3. **You spent $5 on lunch:**
   - This means you subtracted $5 from your total.
   - After lunch, your total amount of money is $ x + 15 - 5 $.

4. **You spent $21 on a new phone case:**
   - This means you subtracted $21 from your total.
   - After buying the phone case, your total amount of money is $ x + 15 - 5 - 21 $.

5. **At the end of the day, you had $27:**

   Set up the equation with the remaining amount:

   \[
   x + 15 - 5 - 21 = 27
   \]

6. **Simplify the equation:**

   \[
   x + 10 - 21 = 27
   \]
   
   \[
   x - 11 = 27
   \]

7. **Solve for $ x $:**

   \[
   x = 27 + 11
   \]
   
   \[
   x = 38
   \]

Therefore, you had **$38** at the beginning of the day.

Would you like more details or have any questions?

### Related Questions:

1. How much money did you have after taking $15 out of the bank?
2. How much money did you spend in total during the day?
3. If you had spent $10 less on the phone case, how much money would you have left at the end of the day?
4. How much more would you need to save to have $50 at the end of the day?
5. If you found $5 on the ground at the end of the day, how much would you have?

### Tip:

When working with financial transactions, it can help to write down each transaction and its effect on your total to avoid mistakes.

Learn how to calculate the initial amount of money using arithmetic operations based on transactions. This problem involves basic arithmetic and equation solving, suitable for Grades 4-6.

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