21. Simplify : $${{{5 \over 3} \times {7 \over {51}}{\text{ of }}{{17} \over 5} - {1 \over 3}} \over {{2 \over 9} \times {5 \over 7}{\text{ of }}{{28} \over 5} - {2 \over 3}}}$$
22. 1 - [5 - {2 + (- 5 + 6 - 2) 2}] is equal to:
23. Assume that $$\sqrt {13} $$ = 3.605(approximately) and $$\sqrt {130} $$ = 11.40(approximately) Find the value of: $$\sqrt {1.3}$$ $$+$$ $$\sqrt {1300}$$ $$+$$ $$\sqrt {0.013} $$
24. $$1888 \div 32 \div 8 = ?$$
25. $$4848 \div 24 \times 11 - 222 = ?$$
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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