Write a short story problem that can be solved in one step. Write and equation that represents the problem. Name the property used to solve the problem, and then solve the problem.
Story Problem:
Sally had some money in her piggy bank. She received $10 for her birthday and put it in her piggy bank. Now she has $25 in her piggy bank. How much money did Sally have in her piggy bank before her birthday?
Equation:
x + 10 = 25
Property Used:
To solve the problem, we can use the subtraction property of equality.
Solution:
x + 10 - 10 = 25 - 10
x = 15
Therefore, Sally had $15 in her piggy bank before her birthday.