What approximate value will come in place of the question mark (?) in the following expression?

$$129.92 + 199.89 + 40.01\% ext{ of } 160.21 + 6.12 = ?^2$$

Question

What approximate value will come in place of the question mark (?) in the following expression?

$$129.92 + 199.89 + 40.01\% 	ext{ of } 160.21 + 6.12 = ?^2$$

Accepted Answer

**Solution:**

1. Calculate the approximate value of each term:
   - $129.92 \approx 130$
   - $199.89 \approx 200$
   - $40.01\%$ of $160.21 \approx 40\%$ of $160 = 0.40 	imes 160 = 64$
   - $6.12 \approx 6$

2. Add these approximations:
   $$130 + 200 + 64 + 6 = 400$$

3. The expression equals $?^2$, so:
   $$?^2 = 400$$

4. Taking the square root on both sides:
   $$? = \sqrt{400} = 20$$

**Answer:** $20$

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