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 54

( 1800 $$\div \sqrt{?}$$ $$\times$$ 29.99 ) $$\div$$ 15.02 = 144

Solution

Expression : ( 1800 $$\div \sqrt{?}$$ $$\times$$ 29.99 ) $$\div$$ 15.02 = 144

= $$\frac{1800}{\sqrt{?}} \times \frac{30}{15} = 144$$

= $$\sqrt{?} = \frac{1800 \times 2}{144} = 25$$

$$\therefore$$ ? = 25 * 25 = 625

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