Split the rows into two groups: the first 10 rows and the remaining 25 rows.<br><br>
&bull; First 10 rows: 10 &times; 42 = 420 chairs<br>
&bull; Remaining rows: 35 &minus; 10 = 25 rows<br>
&bull; 25 rows &times; 56 = 1400 chairs<br>
&bull; Total chairs = 420 + 1400 = 1820<br><br>
Final Answer: 1820