Question 68

The average of seven numbers is 20. If 2 is subtracted from each number, then what will the new average be?

Solution

The average of seven numbers is 20.

total of seven numbers = $$20\times7$$ = 140

If 2 is subtracted from each number.

New average = $$\frac{140-2\times\ 7}{7}$$

= $$\frac{140-14}{7}$$

= $$\frac{126}{7}$$

= 18

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