Solution
Given : $$(x^2 + y^2) = 113$$ and $$xy = 56$$
Using $$(x + y)^2 = x^2 + y^2 + 2xy$$
=> $$(x + y)^2 = 113 + (2 \times 56)$$
=> $$(x + y)^2 = 113 + 112 = 225$$
=> $$(x + y) = \sqrt{225} = 15$$
=> Ans - (D)
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