Instructions

What should come in place of question mark (?) in the following questions?

Question 92

$$\sqrt{?}+15^{2}=235$$

Solution

Let the number to replace the question mark be equal to $$X$$

Therefore, $$\sqrt{X}+15^{2}=235$$
So, $$\sqrt{X} + 225 = 235$$
Therefore, $$\sqrt{X} = 235 - 225 = 10$$

Hence, $$X = 100$$

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