Question 89

If $$\sqrt{20} + \sqrt{125} = 15.65$$, then what is the value of $$\sqrt{45} + \sqrt{5}$$?

Solution

Given : $$\sqrt{20}+\sqrt{125}=15.65$$

=> $$2\sqrt5+5\sqrt5=15.65$$

=> $$\sqrt5=\frac{15.65}{7}$$ ----------(i)

To find : $$\sqrt{45}+\sqrt5$$

= $$3\sqrt5+\sqrt5=4\sqrt5$$

= $$4\times\frac{15.65}{7}\approx8.94$$

=> Ans - (B)

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