Interview Interview Programming Database

In writing a SQL join query Which table should be on the left side,Whether a heavily weighed table or a lightly weighed table??

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11*11=171
12*12=220
13*13=251
14*14=304
15*15=?
6. The average of 100 numbers is 50. It is found that while calculating the average of two numbers, namely 81 and 66 were wrongly read as 18 and 6. The correct average is