51. If $$\sqrt {x + \frac{x}{y}} = x\sqrt {\frac{x}{y}} {\text{,}}$$ where x and y are positive real numbers, then y is equal to ?
52. The number $${\text{2}}{{\text{5}}^{64}} \times {64^{25}}$$ is the square of a natural number n. The sum of the digits of n is = ?
53. If $$0.13 \div {p^2} = 13{\text{,}}$$ then p equals = ?
54. If $$\sqrt {{3^n}} = 729$$ , then the value of n is ?
55. If $$\sqrt x \div \sqrt {441} = 0.02{\text{,}}$$ then the value of x is ?
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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