Find the approximate value that should replace the question mark (?) in the equation below (note that an exact calculation is not required).
Correct Answer :
10
Solution :
The correct option is 10.
We are asked to find the approximate value of the question mark (?) in the following equation:
Step 1: Approximate the numbers to simplify calculations.
Let us round off the numbers to their nearest manageable values:
- can be approximated as
- can be approximated as (or notice that directly)
- can be approximated as
Step 2: Evaluate the left side of the equation.
Calculating exact division on the left-hand side:
First,
Next, divide by :
Step 3: Substitute back into the equation to solve for (?).
Now the equation becomes:
Multiplying both sides by :
Taking the square root on both sides:
Hence, the approximate value that replaces the question mark is 10.
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