1.

\left. \begin{array} { l } { \text { Evaluate } \frac { 15 } { \sqrt { 10 } + \sqrt { 20 } + \sqrt { 40 } - \sqrt { 50 } } , \text { it being given that } } \\ { \sqrt { 10 } = 3.162 } \end{array} \right.

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