Instructions

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

Question 98

$$\sqrt{898}\times(12.005)^{2} + ?=5000$$

Solution

Expression : $$\sqrt{898}\times(12.005)^{2} + ?=5000$$

$$\approx \sqrt{900} \times (12)^2 + x = 5000$$

=> $$(30 \times 144) + x = 5000$$

=> $$x = 5000 - 4320$$

=> $$x = 680$$

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