Instructions

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

Question 123

$$\frac{15}{31}\div\frac{90}{186}\times\frac{729}{9}=(?)^{2}$$

Solution

Expression : $$\frac{15}{31}\div\frac{90}{186}\times\frac{729}{9}=(?)^{2}$$

=> $$?^2 = \frac{15}{31} \times \frac{186}{90} \times 81$$

=> $$?^2 = 1 \times 81 = 81$$

=> $$? = \sqrt{81} = \pm9$$

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