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use property
if no of objects remain constant and their average is also constant and we want to add/sub/mul/div something then the no is add/sub/mul/div in both sides
new average 56+5=61
if no of objects remain constant and their average is also constant and we want to add/sub/mul/div something then the no is add/sub/mul/div in both sides
new average 56+5=61
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