26. (98764 + 89881 + 99763 + 66342) ÷ (1186 + ? + 1040 + 1870) = 55
27. Simplify : $$\frac{{\frac{5}{3} \times \frac{7}{{51}}{\text{ of }}\frac{17}{5} - \frac{1}{3}}}{{\frac{2}{9} \times \frac{5}{7}{\text{ of }}\frac{{28}}{5} - \frac{2}{3}}}{\kern 1pt} {\kern 1pt} = ?$$
28. $$853 + ? \div 17 = 1000$$
29. $$\left( {? - 968} \right) \div 79 \times 4 = 512$$
30. Simplify : $$1 - \left[ {1 - \left\{ {1 - \left( {1 - \overline {1 - 1} } \right)} \right\}} \right]$$
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