56.
$$\sqrt {\frac{{0.0196}}{?}} = 0.2$$

57.
If $$\sqrt {1369} + \sqrt {0.0615 + x} $$      = 37.25, the x is equal to ?

58.
If $$\sqrt {\left( {x - 1} \right)\left( {y + 2} \right)} = 7,$$     x and y being positive whole numbers, then the values of x and y respectively are ?

59.
Three-fifth of the square of a certain number is 126.15. What is the numbers ?

60.
If $$\sqrt {1 + \frac{x}{{169}}} {\text{ = }}\frac{{14}}{{13}}{\text{,}}$$    then x is equal to ?

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