Instructions

What approximate value will come in place of the question mark (?) in the following questions ? (You are not expected to calculate the exact value).

Question 53

$$349.98 \times 19.99 + ?^2 \times 180.16 = 11500$$

Solution

Expression : $$349.98 \times 19.99 + ?^2 \times 180.16 = 11500$$

= $$(350 \times 20) + (?^2 \times 180) = 11500$$

= $$?^2 \times 180 = 11500 - 7000 = 4500$$

= $$?^2 = \frac{4500}{180} = 25$$

= $$? = \sqrt{25} = 5$$

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