11. What is the value of $$0.51\overline {345} $$ in vulgar fraction?
12. If $${\text{A}} = 3\frac{1}{4} \times 4\frac{1}{4} \div 34 - \frac{{47}}{{32}} + \frac{{47}}{{16}}$$ and $${\text{B}} = 2\frac{1}{2} + 5\frac{1}{2} \div 55 - \frac{{11}}{{10}}$$ then what is the value of A - B?
13. The value of $$0.\overline {57} - 0.4\overline {32} + 0.3\overline 5 $$ is:
14. If 3.352 - (9.759 - x) - 19.64 = 7.052, then what is the value of x?
15. The value of $$\frac{8}{9}{\text{ of}}\left( {5\frac{1}{4} \div 2\frac{1}{3}{\text{ of }}4} \right) \div \left( {8 \div \frac{2}{3}{\text{ of }}\frac{4}{5}} \right){\text{of}}\left( {8 \times \frac{2}{3} \div \frac{4}{5}} \right){\text{is:}}$$
16. The value of $$\frac{{\left\{ {\left( {{m^2} + {n^2}} \right)\left( {m - n} \right) - {{\left( {m - n} \right)}^3}} \right\}}}{{\left( {{m^2}n - m{n^2}} \right)}}$$ is:
17. If 56 × 75 × 60 × 84 × 210 = 2p × 3q × 5r × 7s, then what is the value of $$\left[ {\frac{{\left( {{\text{p}} + {\text{q}}} \right)}}{{\text{s}}}} \right] + {\text{r}}?$$
18. Solve the following $$\frac{{24 \div \frac{3}{8}{\text{of}}\left( {8 + 2 \times \overline {7 - 3} } \right) + \left[ {\frac{2}{{11}} \div \frac{4}{{55}} - \left\{ {\frac{5}{8} + \frac{6}{{16}}} \right\}} \right]}}{{32 \div \overline {15 - 7} + 75 \div \left( {6 + 15 \div 3 + 4} \right)}}$$
19. If $$\frac{{45}}{{53}} = \frac{1}{{a + \frac{1}{{b + \frac{1}{{c - \frac{2}{5}}}}}}},$$ where a, b and c are positive integers, then what is the value of (4a - b + 3c)?
20. The value of $$\left( {1\frac{1}{3} \div 2\frac{6}{7}{\text{ of }}5\frac{3}{5}} \right) \div \left( {6\frac{2}{5} \div 4\frac{1}{2}{\text{ of}}\,5\frac{1}{3}} \right) \times \left( {\frac{3}{4} \times 2\frac{2}{3} \div \frac{5}{9}{\text{ of }}1\frac{1}{5}} \right) = 1 + {\text{k}},$$ where k lies between:
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