What approximate value will come in place of the question mark (?) in the following questions ? (You are not expected to calculate the exact value).
( 52.02^{2} - 34.01^{2}) $$\div$$ 17.99 $$\times$$ $$\sqrt{?}$$ = 1720
Expression : ( 52.02^{2} - 34.01^{2}) $$\div$$ 17.99 $$\times$$ $$\sqrt{?}$$ = 1720
= $$(52^2 - 34^2) \div 18 \times \sqrt{?} = 1720$$
= $$\frac{(52 - 34) (52 + 34)}{18} \times \sqrt{?} = 1720$$
= $$\sqrt{?} = \frac{1720}{86} = 20$$
$$\therefore$$ ? = 20 * 20 = 400
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