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Solution:

















                   4.  A picture hall has seats for 820 persons. At a recent film show, one usher

                       guessed it was   full, another that it was   full. The ticket office reported 648
                       sales. Which usher (first or second) made the better guess?
                       Solution:
                       Total number of seats = 820
                       Number of ticket sold = 648

                       For first usher =   × 648 = 3 × 162 = 486
                       For second usher =   × 648 = 2 × 216 = 432
                       Since 432 < 486
                       Hence, the first usher guessed better.
                   5.
               Simplify:


               (i)



               (ii)
               Solution:

               (i) We have,
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