What will come in the place of (?) mark in following question.

20% of (150 + ?) = 50

The correct option is 100.

Let us solve the equation step-by-step to find the value that replaces the question mark (?). Let the unknown value be represented by $x$.

The given equation is:

$20\%\text{ of }(150+x)=50$

First, convert the percentage into a fraction:

$20\%=\frac{20}{100}=\frac{1}{5}$

Now, substitute this fraction back into the equation:

$\frac{1}{5}\times (150+x)=50$

Multiply both sides of the equation by 5 to isolate the term in the parentheses:

$150+x=50\times 5$

$150+x=250$

Subtract 150 from both sides to find the value of $x$:

$x=250-150$

$x=100$

Thus, the value that should come in place of the question mark is 100.