When twice of a number added to 3 is multiplied by 5 and added to the number itself, it gives 158. What is the square of that number?

Let the number be $x$.According to the problem statement:"twice of a number added to 3": $2x+3$ "is multiplied by 5": $5(2x+3)$ "and added to the number itself": $5(2x+3)+x=158$ Let's solve for $x$:
$$10x+15+x=158$$
$$11x+15=158$$
$$11x=158-15$$
$$11x=143$$
$$x=\frac{143}{11}=13$$
The question asks for the square of that number:
$$\text{Square of }x=13^2=169$$