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Instructions
What should come in place of the question mark (?) in the following questions?
Solution
Expression : $$90780\div\sqrt{?}=85\times12$$
=> $$\frac{90780}{\sqrt{?}} = 85 \times 12$$
=> $$\sqrt{?} = \frac{90780}{85 \times 12} = 89$$
=> $$? = 89^2 = 7921$$
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