Question 89

Find the missing number to establish the same pattern in all figures.

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Solution

The top number is the sum of the square roots of the two numbers below it. For the first figure $$\sqrt{16} + \sqrt{25} = 4 + 5 = 9$$, and for the second $$\sqrt{36} + \sqrt{49} = 6 + 7 = 13$$. So the missing number is $$\sqrt{100} + \sqrt{121} = 10 + 11 = 21$$.

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