Hello!
Answer:

Explanation:
→ We want to solve the number if "a certain number is added to 1/2 of itself and the results is 1".
→ Let the number be x
→ Let's translate the problem in equation:

→ Let's solve this equation to find the number:
◼ Convert x in fraction with 2 as the denominator:

◼ Simplify the left side:

◼ Multiply both sides by 2:

◼ Simplify both sides:

◼ Divide both sides by 3:

◼ Simplify both sides:

Conclusion:
The number is 2/3.