The average of seven numbers is 20. If 2 is subtracted from each number, then what will the new average be?
The average of seven numbers is 20.
total of seven numbers = $$20\times7$$ = 140
If 2 is subtracted from each number.
New average =Â $$\frac{140-2\times\ 7}{7}$$
= $$\frac{140-14}{7}$$
= $$\frac{126}{7}$$
= 18
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