189.98 + 49.96% of 539.98 + ? = 630.03
Find the approximate value of question marks (?) in following questions?

The correct option is 170.

We are given the following approximation equation to solve:
$189.98+49.96\%\text{of}539.98+?=630.03$

Step 1: Round off the values to their nearest whole numbers for estimation.
- $189.98\approx 190$
- $49.96\%\approx 50\%$
- $539.98\approx 540$
- $630.03\approx 630$

Step 2: Substitute these rounded values back into the equation.
$190+50\%\text{of}540+?=630$

Step 3: Calculate 50% of 540.
$50\%\text{of}540=\frac{50}{100}\times 540=270$

Step 4: Solve for the unknown value (?).
$190+270+?=630$
$460+?=630$
$?=630-460$
$?=170$

Thus, the approximate value of the question mark (?) is 170.