Answer: The correct option is (D) 40.
Step-by-step explanation: We are given to solve the following equation for the value of x :
[tex]\dfrac{1}{2}x=20~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(i)[/tex]
To solve for x, we must multiply each side of equation (i) by 2.
So, from equation (i), we get
[tex]\dfrac{1}{2}x=20\\\\\Rightarrow 2\times\dfrac{1}{2}x=2\times20~~~~~~~~~~~~~~~~~~~~~[\textup{Multiplying equation (i) both sides by 2}]\\\\\Rightarrow x=40.[/tex]
Thus, the required value of x is 40.
Option (D) is CORRECT.
