21. If $$2 = x + \frac{1}{{1 + \frac{1}{{5 + \frac{1}{2}}}}},$$ then the value of x is equal to:
22. The value of $$\frac{2}{3} \div \frac{3}{{10}}{\text{ of }}\frac{4}{9} - \frac{4}{5} \times 1\frac{1}{9} \div \frac{8}{{15}} + \frac{3}{4} \div \frac{1}{2}{\text{ is:}}$$
23. Determine the missing figure (denoted by $$ * $$), in the following equation. $$15\frac{3}{5} \times \frac{ * }{3} = 26$$
24. The value of $$7\frac{1}{2} \times \left( {3\frac{1}{5} \div 4\frac{1}{2}{\text{ of }}5\frac{1}{3}} \right) + \left[ {11 - \left( {\frac{5}{8} + 3 - 1\frac{1}{4}} \right)} \right] \div 5\frac{3}{4} - 5 \div 5 \times 5\,{\text{of }}5 \div 25\,{\text{is:}}$$
25. The denominator of a fraction is 4 more than twice the numerator. When the numerator is increased by 3 and the denominator is decreased by 3, the fraction becomes $$\frac{2}{3}.$$ What is the difference between the denominator and numerator of the original fraction?
26. The value of $$0.4\overline 6 + 0.7\overline {23} - 0.3\overline 9 \times 0.\overline 7 $$ is:
27. If x is the square of the number when $$\left( {\frac{2}{5}{\text{ of }}6\frac{1}{4} \div \frac{3}{7}} \right)$$ of $$1\frac{2}{7}$$ is divided by $$11\frac{1}{4},$$ then the value of 81x is:
28. What will come at place of x, (x < 10) for $$\frac{{\left( {132 \div 12 \times x - 3 \times 3} \right)}}{{\left( {{5^2} - 6 \times 4 + {x^2}} \right)}} = 1?$$
29. The value of $$\frac{{\root 3 \of { - 2744} \times \root 3 \of { - 216} }}{{\root 3 \of {\frac{{64}}{{729}}} }}$$ is :
30. The value of $$\frac{{1.6 \times 1.6 \times 1.6 - 0.6 \times 0.6 \times 0.6}}{{1.6 \times 1.6 + 1.6 \times 0.6 + 0.6 \times 0.6}}$$ is:
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