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 37

$$30.01^{2}-19.98^{2}-?=21.81^{2}$$

Solution

The given question can be written as $$30^{2}-20^{2}-22^{2}=?$$

$$900-400-484 = 16$$

Option E is the right answer.

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