21. If x : y = 7 : 3 then the value of $$\frac{{xy + {y^2}}}{{{x^2} - {y^2}}}{\text{ is?}}$$
22. If [p] means the greatest positive integer less than or equal to p, then $$\left[ { - \frac{1}{4}} \right] + \left[ {4 - \frac{1}{4}} \right] + \left[ 3 \right]$$ is equal to?
23. The value of $$\frac{{{{\left( {243} \right)}^{\frac{n}{5}}}{{.3}^{2n + 1}}}}{{{9^n}{{.3}^{n - 1}}}}{\text{ is?}}$$
24. If x = 0.5 and y = 0.2, then the value of $$\sqrt {0.6} \times {\left( {3y} \right)^x}$$ is equal to?
25. If $${x^{x\sqrt x }} = {\left( {x\sqrt x } \right)^x}{\text{,}}$$ then x equals to?
26. If a = 7, b = 5 and c = 3, then the value of a2 + b2 + c2 - ab - bc - ca is?
27. If $${{\text{7}}^x}{\text{ = }}\frac{1}{{343}}{\text{,}}$$ then the value of x is?
28. $$\frac{{\frac{1}{3}.\frac{1}{3}.\frac{1}{3} + \frac{1}{4}.\frac{1}{4}.\frac{1}{4} - 3.\frac{1}{3}.\frac{1}{4}.\frac{1}{5} + \frac{1}{5}.\frac{1}{5}.\frac{1}{5}}}{{\frac{1}{3}.\frac{1}{3} + \frac{1}{4}.\frac{1}{4} + \frac{1}{5}.\frac{1}{5} - \left( {\frac{1}{3}.\frac{1}{4} + \frac{1}{4}.\frac{1}{5} + \frac{1}{5}.\frac{1}{3}} \right)}}{\text{ is?}}$$
29. If 0.13 × p2 = 13, then p is equal to?
30. If $$x = 7 - 4\sqrt 3 {\text{,}}$$ then $$\sqrt x {\text{ + }}\frac{1}{{\sqrt x }}$$ is equal to?
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