Write a real- world problem that can be solved by writing and solving the equation 3 + 10 = X +3.

Sure! One real-world problem that can be solved using the equation 3 + 10 = X + 3 is determining how much money X has in their pocket after receiving $10 and spending $3.

To solve this problem using the equation, you can follow these steps:

1. Start with the given equation: 3 + 10 = X + 3.
This equation represents the initial amount of money X has (unknown value), which is increased by $10 and then decreased by $3.

2. Simplify the equation: Add 3 and 10 on the left side of the equation.
This gives you: 13 = X + 3.

3. To find the value of X, isolate it on one side of the equation. You can do this by subtracting 3 from both sides.
Thus, 13 - 3 = X + 3 - 3. Simplifying this further gives you: 10 = X.

Therefore, the solution to the problem is X = 10. This means that X has $10 in their pocket after receiving $10 and spending $3.